nêu khái niện;ưu điểm;nhược điểm của phương pháp nhân giống hữu tính
I. Combine each pairs of these sentences, using in order to / so as not to :
1. I have to go to the bank. I want to change some money.
2. He left his rifle outside. He didn’t want to frighten his wife.
3. Nguyen is studying English. He wants to go to an American university.
4. He read only for short periods each day. He didn’t want to strain his eyes.
5. They got up very early. They wanted to get to the top of the hill before sunrise.
6. We must keep our gloves on. We don’t want to get cold.
7. Nam knocked on the door. He wanted to wake me up.
8. He studied hard. He didn’t want to repeat classes.
9. I am buying paint. I want to repaint the gate of my house.
10. I took off my shoes. I didn’t want to make any noise.
11. I am saving money. I want to go to Canada to visit my cousin.
12. He was playing softly. He didn’t want to disturb anyone.
I. Combine each pairs of these sentences, using in order to / so as not to :
1. I have to go to the bank. I want to change some money.
2. He left his rifle outside. He didn’t want to frighten his wife.
3. Nguyen is studying English. He wants to go to an American university.
4. He read only for short periods each day. He didn’t want to strain his eyes.
5. They got up very early. They wanted to get to the top of the hill before sunrise.
6. We must keep our gloves on. We don’t want to get cold.
7. Nam knocked on the door. He wanted to wake me up.
8. He studied hard. He didn’t want to repeat classes.
9. I am buying paint. I want to repaint the gate of my house.
10. I took off my shoes. I didn’t want to make any noise.
11. I am saving money. I want to go to Canada to visit my cousin.
12. He was playing softly. He didn’t want to disturb anyone.
1. I have to go to the bank. I want to change some money.
2. He left his rifle outside. He didn’t want to frighten his wife.
3. Nguyen is studying English. He wants to go to an American university.
4. He read only for short periods each day. He didn’t want to strain his eyes.
5. They got up very early. They wanted to get to the top of the hill before sunrise.
6. We must keep our gloves on. We don’t want to get cold.
7. Nam knocked on the door. He wanted to wake me up.
8. He studied hard. He didn’t want to repeat classes.
9. I am buying paint. I want to repaint the gate of my house.
10. I took off my shoes. I didn’t want to make any noise.
11. I am saving money. I want to go to Canada to visit my cousin.
12. He was playing softly. He didn’t want to disturb anyone.
I. Choose the correct answers in A, B, C or D to complete each sentence
1. Bob hasn’t ……… his mind yet.
A. made
B. gone
C. used to
D. found
2. Everyone has to follow this way to get into the fair, ………?
A. do they
B. don’t they
C. doesn’t she
D. doesn’t he
3. We spent half a year _____ this hotel.
A. to build
B. built
C. with building
D. building
4. She is bored _____ getting up early.
A. with
B. in
C. of
D. to
5. Would you like me to get you something to drink? - ______
A. That would be nice
B. No, I’m sorry
C. That’s too bad
D. My pleasure
6. English is the _____ language on one- fifth of the land area of the world.
A. office
B. official
C. officer
D. officially
7. It's an hour since he ......... , so he must be at the office now.
A. has left
B. left
C. was leaving
D. is leaving
8. I usually go to work by bus, but ________ and then I use my motorbike.
A. again
B. Once
C. now
D. ever
9. Of my parents, my father is _________________.
A. the stricter
B. the strictest
C. stricter
D. strict
10. "What can I get for you?". ______________ .
A. All right
B. I'm afraid not
C. I hope so
D. Yes, please