Cho tam giác ABC. Vẽ đường tròn (O) đi qua A và tiếp xúc với BC tại B. Kẻ dây BD song song với AC. Gọi I là giao điểm của CD với đường tròn. Chứng minh góc IAB = góc IBC= góc ICA

B iện luận nghiệm của hệ phương trình:

ax-y=2a và x=ay=3+a

Put the verbs in this blankets into the correct form:

1....(you/remember)...(make) yourself and your little sister sandwiches to school tomorrow morning,Greg?

2.As soon as they...(complete)...(reconstruct) the hippodrome,the horse-riders...(be able) to resume...(pratise).

3.Before the boss arrived,Danie...(manage)...(carry) out all the orders he...(give) her the previous day.

4.It's predicted that end ofhe by this year more than three hundred private firms...(go) out of bussiness.

5.As a child,Ms Murphy...(travel) a lot with her parents,that's why she's not scared of...(flying).

6.I hate...(be) so short.If only I...(be) thirty cm higher,nobody...(call) me a midget.

7.So far,we...(show) only two of all the tourists attractions that the guides...(promise)...(take)...us to.

8.The suspects...(charge) with murder if the police...(deliver) suffcient evidence soon.

9.Since earyly morning,there...(be) a horrendous traffic jam on the highway.A young motorist is said...(cause) an accident.

10.This evening,our manages...(launch) an official party in a luxury hotel.John and I...(not take) part in it.We're just blue-collar workers.

11.You know how much aunt Lucinda likes you.You oughtn't to...(forget) about her birthday.

12.The teacher opened the window and...(see) that two boys...(fight).However,before he...(come) downstairs,one of them...(escape).

13.It's not Gina who;s getting married,it's her sister.But she's having as though she...(be) the most important day.

14.Hardly...(the doctor/leave) when I...(feel) even harsher pain in my shine.

15.Althogh we...(try)...(find) a definite solution to the crisis situation for several days,the only things we...(achive) so far is wider coverage from the mass media.

1.They didn't find our offer attractive.So,their...(refuse) to sign the contract wasn't a surprise to us.

2.Don;t be...(respect) towards people if you want them to respect you.

3.Everybody could see..(annoy) on our chairman's face when he learned that most votes were against you.

4.Charles'...(devote) to helping animals has earned him friends among other nature lovers.

5.We thanked warmly all our family and friends for being so...(sympathy) when our father died.

6.To survice in extreme conditions till rescue arrives,one must learn to...(economy) on water and food supplies.

7.Gina is so...(create).She's always full of ideas.

8.The coach says his players are well prepared for the game and he's...(hope) of a win.

9.The number of people who volunteered to help was quite...(precedent).We had never had such great response to our appeals before.

10.It;s a typical practice in the company that...(efficent) workers are replaced by new ones.

11.I still get chills when I remember that...(fright) experience.I have never flown a plane since that time.

13.Among all...(nature) disaters,earthquakes are the least predicable.

14.Do you like Chinese cuisine of Italian one?What's your ...(prefer)?

10.As soon as the pond...(clean) and...(fill) with fresh water,we...(put) goldfish in it.

11.Although no offical report...(issue) as yet,the American runner...(believe)...(win) the race by a hair's breadth.

12.No till lats week...(we/know) that our daughter-in-law was pregnant.Imagine our hapiness when we...(learn) we...(be) grandparents.

13.None of the miners..(manage)...(escape) before the wall of coal went down.Some of them...(still/look) for my special emergency units.

14.Provided that the rain...(ease) off soon,we...(take) advantage of the possobility...(climb) to the very top of the moutain.

15.It was kind of you...(let) us know about all the changes in the tax law.If we...(not know) about them we...(make) mistakes in our tax declarations.

1.They didn't find our offer attractive.So,their...(refuse) to sign the contract wasn't a surprise to us.

2.Don;t be...(respect) towards people if you want them to respect you.

3.Everybody could see..(annoy) on our chairman's face when he learned that most votes were against you.

4.Charles'...(devote) to helping animals has earned him friends among other nature lovers.

5.We thanked warmly all our family and friends for being so...(sympathy) when our father died.

6.To survice in extreme conditions till rescue arrives,one must learn to...(economy) on water and food supplies.

7.Gina is so...(create).She's always full of ideas.

8.The coach says his players are well prepared for the game and he's...(hope) of a win.

9.The number of people who volunteered to help was quite...(precedent).We had never had such great response to our appeals before.

10.It;s a typical practice in the company that...(efficent) workers are replaced by new ones.

11.I still get chills when I remember that...(fright) experience.I have never flown a plane since that time.

12.Judging people by...(appear) doesn't make sense.You can always misjudge someone.

13.Among all...(nature) disaters,earthquakes are the least predicable.

14.Do you like Chinese cuisine of Italian one?What's your ...(prefer)?

Give the correct form of the verbs:

1.Isn't it about time you should....(have) a rest?You...(look) tired.You...(dig)the garden for about four hours now.

2.It is predicted that by 2050 people...(set) foot on Mars and...(already/start)...(get) ready...(colonize) the planet.

3.Tom regrets ...(not ask) his father for advice.If only he...(tell) him about everything,he...(know) how...(act) in that difficult situation.

4.Yesterday I...(put) these files on the desk in my office.However,they...(disappear) and I have no idea where...(look) for them.Someone must...(take) them by mistake.

5.It was about ten p.m when the scouts...(reach) their destination.They...(walk) for more than twelve hours.

6.You should...(avoid)...(walk) in high grass.In case you...(bite) by a snake,make a serum injection to yourself.

7.In 1978,the man...(charge) with fraud.He...(spend) four years in prison before he...(release) in 1982.

8.''Who...(lead) the conference tomorrow?''

''Mr Hanks,our department manager,...(agree)...(stand) in for Mr hewitt while he's on sick leave''

9.We...(have) the windows in the sitting room insulated recently but it...(keep)...(blow) cold from outside.

10.As soon as the pond...(clean) and...(fill) with fresh water,we...(put) goldfish in it.

11.Although no offical report...(issue) as yet,the American runner...(believe)...(win) the race by a hair's breadth.

12.No till lats week...(we/know) that our daughter-in-law was pregnant.Imagine our hapiness when we...(learn) we...(be) grandparents.

13.None of the miners..(manage)...(escape) before the wall of coal went down.Some of them...(still/look) for my special emergency units.

14.Provided that the rain...(ease) off soon,we...(take) advantage of the possobility...(climb) to the very top of the moutain.

15.It was kind of you...(let) us know about all the changes in the tax law.If we...(not know) about them we...(make) mistakes in our tax declarations.

vẽ sơ đồ mối quan hệ giữa gen và tính trạng,nguyên tắc bổ sung được thể hiện như thế nào trong sơ đồ đó?Mối quan hệ đó được thể hiện như thế nào trong sơ đồ?

so sánh cấu tạo hóa học,cấu trúc không gian,chức năng của ADN,ARN,protein