1. Chọn đáp án đúng của những câu sau:
1. I ..................................the accident when I was waiting for the taxi.
a. saw | b. was seeing | c. seen | d. had seen |
2. What ................................. you do when I phoned?
a. was doing | b. had done | c. do | d. did |
3. They .......................................their friends last summer holiday.
a. didn’t visit | b. wasn’t visiting | c. don’t visit | d. had visited |
4. It ..........................................heavily last July.
a. rained | b. rain | c. was raining | d. is raining |
5. While people were talking to each other, he ................................... his book.
a. read | b. was reading | c. reading | d. had read |