Chang’e-3 made China become the third nation _____ an unmanned spacecraft on the moon.
| A．sends | B．to send |
| C．sent | D．sending |
---Could you turn the TV down a little bit?
---______. Is it disturbing you?
| A．Take it easy. | B．I’m sorry. | C．Not a bit | D．It depends |
Unfortunately when we arrived she ___, So we only had time for a few words.
| A．just left | B．has just left | C．was just leaving | D．had just left |
---Where is mother?
---She is in the kitchen. She ___ the dinner for the party the whole afternoon.
| A．is preparing | B．was preparing | C．has preparing | D．has been preparing |
The students _______ busily when Miss Brown went to get a book she _______ in the office.
| A．had written; left | B．were writing; has left |
| C．had written; had left | D．were writing; had left |
The building which _____ now will be our science laboratory.
| A．is being built | B．will be built | C．is built | D．has been built |