Ở một loài thực vật lưỡng bội, tính trạng màu sắc hoa do một gen gồm 2 alen quy định, alen A quy định hoa đỏ trội không hoàn toàn so với a quy định hoa trắng, kiểu gen Aa quy định màu hoa hồng. Chọn ngẫu nhiên 2 cơ thể (P) bất kì trong quần thể cho giao phấn với nhau thu được F1. Giả sử không xảy ra đột biến, theo lí thuyết, kết luận nào sau đây sai?

A. Có 3 trường hợp về kiểu gen của (P) cho F1 có 1 kiểu hình duy nhất.

B. Có 4 trường hợp về kiểu gen của (P) cho F1 có xuất hiện kiểu hình cây hoa hồng.

C. Có 5 trường hợp về kiểu gen của (P) cho F1 có số loại kiểu gen bằng số loại kiểu hình.

D. Có 2 trường hợp về kiểu gen của (P) cho F1 có 2 loại kiểu hình khác nha

1.    Every country/ have/ own cultural features and so / Vietnam. Below / be / some special cultures / Vietnam.

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2.    First, in Vietnam, three/ four generations / live/ one roof.

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3.    It / normal / when we / see a Vietnamese family / grandparents/ parents/ children / even grandchildren.

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4.    Secondly, Vietnamese people/ often / celebrate/ death days. On these days, they / prepare meals / invite/ relatives or friends / get together / and talk/ good respect / death person.

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5.    Finally, when Vietnamese people / come / to visit / other people’s house, they often greet/ head / the house / or / oldest person first, then, young ones.

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6.    I / just mention / some special cultures / Vietnam and as/ Vietnamese person, I /be/ proud / my country‘s cultures very much.

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1.  I haven’t heard from him for a long time.

It’s a long time ....................................................

2.  He came home and found his son watching TV.

When he.............................................................

3.     She has never eaten such good eel soup before.

It is the best........................................................

1.  This is my first visit to Hungary.

→ This is the first time. ...........................................................................................................

2.  Mary started learning French five years ago.

→ Mary has been. ..................................................................................................................

3.  I am on the tenth page of the letter I am writing.

→ So far I have. .....................................................................................................................

4.  After I arrived here, I started to feel better.

→ Since arriving here, I ..........................................................................................................

5.  It’s over 20 years since we got married.

→ We have. ...........................................................................................................................

6.  The last time I saw Dick was in 1995.

→ I haven’t .............................................................................................................................

7.  It’s a long time since we last went to a football match.

→ We haven’t.........................................................................................................................

8.  Last night, I finished my homework, and then, I watched TV.

→ Last night, after I had

1.  I haven’t heard from him for a long time.

It’s a long time ....................................................

2.  He came home and found his son watching TV.

When he.............................................................

3.     She has never eaten such good eel soup before.

It is the best........................................................

1.  This is my first visit to Hungary.

→ This is the first time. ...........................................................................................................

2.  Mary started learning French five years ago.

→ Mary has been. ..................................................................................................................

3.  I am on the tenth page of the letter I am writing.

→ So far I have. .....................................................................................................................

4.  After I arrived here, I started to feel better.

→ Since arriving here, I ..........................................................................................................

5.  It’s over 20 years since we got married.

→ We have. ...........................................................................................................................

6.  The last time I saw Dick was in 1995.

→ I haven’t .............................................................................................................................

7.  It’s a long time since we last went to a football match.

→ We haven’t.........................................................................................................................

8.  Last night, I finished my homework, and then, I watched TV.

→ Last night, after I had

1.    Two days ago ,Tom...............1.(drive) to the supermarket (2 .get) ..............some food for his mother  when he (3. see).................Mary. She (4.attack)..........by two big men . He quickly (5. stop)..............to help her . After five minutes both of the men (6. be) .............knocked out. Mary as well as Tom (7. be)..........all right. Mary thanked him for what he (8. do)...........for her by giving him a kiss.

Complete the following sentences.

1.    We have not seen Mr and Mrs Baker........a long time.

A.  after                  B. for

C. before               D. since

2.  Don’t leave..........    I arrive.

A.  after                  B. when

C. till                      D. since

3.    We have not received any letter from him  ...........  he left 4 months ago.

A.  after                  B. when

C. before               D. since

4.    My grandmother died        ...........          she had been ill for a long time.

A.  after                  B. when

C. before               D. since

5.    Last night I went to bed  ...............                        .

A.  after I have finished my homework

B.  before I had dinner

C. when she came to see me

D. as soon as I turned off the light

6.    We will have a big party  ................                        .

A.  when you go to bed

B.  as soon as went back to Vietnam.

C. after we have dinner

D. before we leave for the USA

7.    They will leave           ....................                         .

A.  as soon as they will finish work

B.  as soon as they had finished work

C. as soon as they finish work

D. as soon as they finished work

8.    He has been working for this company ..............

A.  since he had left school

B.  when he left school

C. since he leaves school

D. since he left school

9.    I slipped on the ice while..................

A.  I am skiing             B. I was skiing

C. I have been skiing D. I went skiing

10.  He had finished all his work

A.  as soon as he went to work.

B.  after he went to work.

C. while he was going to school

D. before he left his office

11.  By the time I left school this morning, .

A.  I had studied five lessons.

B.  I have studied five lessons.

C. I will study five lessons.

D. I studied five lessons.

12.  I have known my neighbours...............                     

A.  since a long time ago

B.  when moved here in 1990

C. since we went to the same school

D. for 2 months ago

13.  We last wrote to each other five years ago

A. We haven’t written to each other for five years.

B. We haven’t written to each other since five years

C. We haven’t written to each other five years ago.

D.  It was five years since we wrote to each other.

14.  They last saw each other thirteen years ago.

A.  It was thirteen years since they had seen each other.

B.  They haven’t seen each other for thirteen years ago.

C. They haven’t seen each other since thirteen years.

D.  It is thirteen years since they last saw each other.

15.  The phone rang immediately after I sat down at the table.

A. We had hardly sat down at the table, when the phone rang

B. We had no sooner sat down at the table, when the phone rang

C.  Before we sat down at the table, the phone had rang

D. We sat down at the table, when the phone rang

1.    You       better after you have something to eat.

A.  feel                    B. will feel

C. have felt            D. would feel

2.    Susan              chess when she was a child.

A.  played               B. was playing

C. have played      D. had played

3.    Our teacher .........  us yesterday that he................England several times.

A.  told / visited        B. told / would visit

C. told / has visited D. told / had visited

4.    He ........asleep while he ..............his homework.

A.  fell / did             B. fell / had done

C. fall/ is doing      D. fell / was doing

5.    You.........the value of health until you..............it.

A.  won’t know / lose

B.  haven’t known / lose

C.  haven’t known  / lost

D.  wouldn’t know / had lost

6.    He asked me why I .............there so early.

A.  had come         B. came

C. have come       D. was coming

7.While I was writing a letter, the children.......outside.

A.  was playing       B. were playing

C. are playing        D. have played

8.    After my sister .........     her clothes, she began to study.

A.  washes             B. has washed

C. had washed      D. would wash

9.    We had already begun to our walk when it  ........    to rain.

A.  begins               B. began

C. has begun                     D. had begun

10.  They (come).....          with us as soon as they finish work.

11.  A: How long   ..........               you    ...........  in this school?

A.  did / study         B. do / study

C. have / studied D. were / studying

B: I (24)   .......         here for two years. When I (25)   .........    the 5^th year, I (25)  ..........      able to get a diploma.

24.  A. studied     B. study

C. have studied    D. were studying

25.  A. had finished / would be

B.  finished / had been

C.  have finished / will be

D. finished / was

26.  Do not make a noise: the children    .........            to sleep.

A.  try                     B. have tried

C. were trying        D. are trying

27.  I...........      with you on that subject.

A.  am agree          B. am agreed

C. agreeing           D. agree

28.  I...........          about this for some time now.

A.  know                 B. am knowing

C. knew                 D. have known