5. Having been delayed by heavy traffic, ____

A. it was difficult for her to arrive on time

B. her being late was intolerable

C. it was impossible for her to arrive on time

D. she was unable to arrive on time

6. ____, methane can be used as a fuel

A. It is produced by the fermentation of organic matter

B. The fermentation of organic matter isproduce

C. The production by fermentation of organic matter

D. Produced by the fermentation of organic matter

1. Declared an endangered species in the United States, ______

A. people have gathered the ginseng root almost to the point of extinction

B. the near extinction of the ginseng root is due to excessive gathering

C. the ginseng root has been gathered almost to the point of extinction

D. gathering the ginseng root almost to be the point of extinction

2. _____ the gold medal, he’ll have to do better than that

A. To win

B. In order’win

C. Winning

D. So that he wins

3. To resist corrosion, ___ for today’s car to prevent havoc caused by road salts, gravel, and other materials

A. new coatings developing

B. having new coatings been developed

C. new coatings have been developed

D. development of new coatings

4. With six children on her hands, she’s extremely busy

A. She’s very busy because she always carries her six children

B. She’s very busy because she always carries her six children

C. She’s too busy to look after her six children

D. With six children to look after, she’s extermely busy

12. Having retired from work, ____

A. social work interesrts him

B. it is possible for him to engage in social work

C. Mr Brown devotes all his time to social work

D. his interest is social work

13. ____ Ann by phone, James decided to email her

A. Having failed to contact

B. having failed contacting

C. He failed to contact

D. That he failed to contact

14. ____ with Uranium ore, Marie Curie discovered two elements, radium and polonium

A. While being worked

B. while working

C. Since working

D. having worked

15. Nam defeated the former champion in three sets. He finally won the inter-school table tennis championship

A. Having defeated the former champion in the inter-school table tennis, Nam did not hold the title of champion

B. Although Nam defeated the former champion in three sets, he did not win the title of the inter-school table tennis champion

C. Having defeated the former champion in three sets, Nam won the inter-school table tennis championship

D. Being defeated by the former champion, Nam lost the chance to play the final game of inter-school table tennis champion

Having retired from work, ____

A. social work interests him

B. having failed contacting

C. He failed to contact

D. That he failed to contact

2 vecto có cùng độ dài và ngược hướng gọi là

A. 2 vecto cùng hướng

B. 2 vecto cùng phương

C. 2 vecto đối nhau

D. 2 vecto bằng nhau

She managed to bahave cheerfully ____ her mood

A . despite of

B. irrespective of

C. regarding to

D. regardless

There are some things that you cannot accomplish ____ hard you try

A. however

B. even if

C. otherwise

D. in spite of

Our former manager was understanding when difficulties arose; ___ our new one is inflexible and intolerant

A. even though

B. in contrast

C. consequently

D. seeing that

Nowsadays many people are completely dependent on their moblie phones; ____ twenty years ago they did not even exist

A. therefore

B. otherwise

C. however

D. likewise

Many ordinary people don't realize that fat is not digested in the stomach ____ in the small intestine

A. while

B. because

C. but

D. unless