1. I can't send her a postcard because I don't know her address                                               => If

2. Ann has a bad cold, so she can't go to the circus today                                             

=> If                                           

3. They don't clean the window that's why the room looks rather dark                             

=>If                                                 

4. Sue was ill, so she couldn't go to the party             

=> If                                             

5. They didn't have enough money therefore, they didn't buy the bigger house               

=> If                                                 

6. Mary was not injured in the crash because she was wearing a seat belt                          => If                                             

7. The bus didn't stop because you didn't put your hand up                                         

=> If

III. Transformation

(Simple past vs Past perfect)

      1. Alex phoned the police. He saw the accident.

           → As soon as ..........................................................................................................................

      2. The police arrived so late, so the robbers escaped.

           → By the time ........................................................................................................................

      3. I turned off the lights. After that I left the room.

           → Before ..................................................................................................................................

      4. Everyone went home and afterwards this message arrived.

           → After ......................................................................................................................................

      5. Michael worked as a physicist after graduating from the university.

           → After ......................................................................................................................................

      6. He left school and then joined the army.

           → After ......................................................................................................................................

      7. Mary finished her homework and then went to bed.

           → Before ..................................................................................................................................

(Áp dụng những thì khác)

      8. The frying fan caught on fire. I was making dinner at that time.

           → While ....................................................................................................................................

      10. The flood raced down the valley and destroyed everything on its path

           → When ....................................................................................................................................

      9. I talked to Laura. This made me feel less nervous.

           → Since .....................................................................................................................................

      11. Ms. Johnson will return your call. She’ll have some free time.

           → As soon as ..........................................................................................................................

      12. Susan sometimes feels nervous. She chews her nails.

           → Whenever ...........................................................................................................................

Viết cấu hình e, cho biết chúng thuộc chu kỳ? nhóm?

Cho biết số e thuộc lớp ngoài cùng của nguyên tử các nguyên tố:  Ne(Z=10) ; Mg(Z=12) ; Al(Z=13) ; P(Z=15)   . Kim loại, phi kim hay khí hiếm ?

Viết cấu hình e, cho biết chúng thuộc chu kỳ? nhóm?

Cho biết số e thuộc lớp ngoài cùng của nguyên tử các nguyên tố: O(Z=8) ; F(Z=9) . Kim loại, phi kim hay khí hiếm ?

Viết cấu hình e, cho biết chúng thuộc chu kỳ? nhóm?

Cho biết số e thuộc lớp ngoài cùng của nguyên tử các nguyên tố: Ca(Z=20) ; Ar(Z=18) . Kim loại, phi kim hay khí hiếm ?

điều nào sau đây không đúng khi nói thế giới sống liên tục tiến hóa

A.ADN được truyền qua các thế hệ tế bào và cơ thể

B. sinh vật luôn có cơ chế phát sinh và di truyền biến dị

C. chọn lọc tự nhiên giữ lại các dạng sống thích nghi

D. thế giới sống luôn ổn định, biến dị ít xảy ra

cách sắp xếp các cấp tổ chức sống nào sau đây đúng theo thứ tự từ thấp đến cao

A. bào quan < tế bào<Mô<cơ quan

B.cơ quan<tế bào<mô<bào quan

C.Tế bào<cơ quan<bào quan<mô

D.mô<tế bào<cơ quan<bào quan

B. Sentence transformation: (Gerund - infinitive)

      1. I don’t like getting up in the dark.

           → I can’t stand .......................................................................................................................

      2. Please don’t interrupt me all the time.

           → Would you mind .............................................................................................................

      3. Please don’t smoke in the kitchen.

           → You had better .................................................................................................................

      4. He didn’t smoke any more.

           → He stopped .........................................................................................................................

      5. Walking in the rain gives him pleasure.

           → He enjoys ............................................................................................................................

      6. I always think about the exam.

           → I can’t help .........................................................................................................................

      7. My sister often solves her problem by herself.

           → My sister is accustomed to ........................................................................................

      8. When he is asked about his past, he hates it.

           → He can’t stand ..................................................................................................................

      9. She said she drove too fast through the town.

           → She admitted .....................................................................................................................

      10. Tom wanted to share the bill with Davy.

           → Tom agreed .......................................................................................................................

      11. She told Jane not to forget to buy some bread on the way home.

           → She reminded ...................................................................................................................

      12. Luckily, Peter didn’t pay a fine.

           → Luckily, Peter avoid ......................................................................................................

      13. Polly didn’t do her homework yesterday.

           → Polly forgot .......................................................................................................................

      14. Tom doesn’t want to wait in line.

           → Tom dislikes .....................................................................................................................

      15. My father didn’t smoke any more.

           → My father stopped ..........................................................................................................

      16. It isn’t necessary for you to finish by Saturday.

           → You don’t need ................................................................................................................