Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 28 to 34.

        Foot-racing is a popular activity in the United States. It is seen not only as a competitive sport but also as a way to exercise, to enjoy the camaraderie of like-minded people, and to donate money to a good cause. Though serious runners may spend months training to compete, other runners and walkers might not train at all. Those not competing to win might run in an effort to beat their own time or simply to enjoy the fun and exercise. People of all ages, from those of less than one year (who may be pushed in strollers) to those in their eighties, enter into this sport. The races are held on city streets, on college campuses, through parks, and in suburban areas, and they are commonly 5 to 10 kilometers in length.

        The largest footrace in the world is the 12-kilometer Bay to Breakers race that is held in San Francisco every spring. This race begins on the east side of the city near San Francisco Bay and ends on the west side at the Pacific Ocean. There may be 80,000 or more people running in this race through the streets and hills of San Francisco. In the front are the serious runners who compete to win and who might finish in as little as 34 minutes. Behind them are the thousands who take several hours to finish. In the back of the race are those who dress in costumes and come just for fun. One year there was a group of men who dressed like Elvis Presley, and another group consisted of firefighters who were tied together in a long line and who were carrying a fire-hose. There was even a bridal party, in which the bride was dressed in a long white gown and the groom wore a tuxedo. The bride and groom threw flowers to bystanders, and they were actually married at some point along the route.

In what lines does the author give reasons for why people enter footraces?

A. Foot-racing... and exercise

B. People of all ages... in length

C. The largest... 34 minutes

D. Behind them... a fire-hose

Choose the best answer.

A. are/on 

B. is/on 

C. is/in 

D. are/in

I saw him WATERING the flowers in the garden.
Đây là dạng "ngữ phân từ hiện tại" (V-ing) hay còn gọi là "hiện tại phân từ" water đảm nhận 2 chức năng vừa là noun vừa là verb.

6. "Is it going to be a fine day today?" I asked her.
- I asked her if it was going to be a fine day that day.
7. "He's not at home", she said.
- She said that he was not at home.
8. "Is the bus station far away?" the girl asked.
- The girl wanted to know if the bus station was far away.
9. "Don't stay out late, Ann" Tom said.
- Tom told Ann not to stay out late.
10. "Please let me borrow your car", he said to her.
- He asked her to lend him her car.

11. "Jean, have you seen my golves?" Thomas asked.
-> Thomas asked Jean if he had seen his gloves.
12. "Don't leave the window open, Mary", I said.
-> I told Mary not to leave the window open.
13. "I'll have a cup of tea with you", she said.
-> She said that she would have a cup of with me.
14. "I'll pay him if I can', she said.
-> She said that she would pay him if she could.
15. "What are you going to do next summer?" she asked.
-> She asked us what we were going to do the next summer.

Chọn câu sai

A. Hạt proton bay vào trong từ trường theo phương vuông góc với véc - tơ cảm ứng từ thì quỹ đạo của proton là quỹ đạo tròn có v tăng dần.

B. Hạt proton bay vào trong điện trường theo phương vuông góc với véc - tơ cường độ điện trường thì quỹ đạo của proton là một parabol, độ lớn v tăng dần

C. Hạt proton bay vào trong điện trường theo phương song song với véc - tơ cảm ứng từ thì quỹ đạo của proton không thay đổi.

D. Hạt proton bay vào trong điện trường theo phương song song với véc - tơ cường độ điện trường thì proton sẽ chuyển động thẳng nhanh dần.