It is really _____ useful dictionary and _____ dictionary every one of us needs．
| A．an; a | B．a; the | C．the; a | D．a; a |
We _____ on this project for four hours. Let’s have a rest.
| A．are working |
| B．have been working |
| C．worked |
| D．had worked |
There are over 58,000 rocky objects in _____ space, about 900 of which could fall down onto _____ earth.
| A．the; the |
| B．/; the |
| C．the; / |
| D．a; the |
—Did you catch what I said?
—Sorry. I _____ a text message just now.
| A．had answering |
| B．have answered |
| C．would answer |
| D．was answering |
I feel so excited! At this time tomorrow morning I _____ to Shanghai.
| A．will be flying |
| B．will fly |
| C．have been flying |
| D．have flown |
“The moment _____ soon,” he thought to himself, waiting nervously.
| A．came |
| B．has come |
| C．was coming |
| D．is coming |