---If the shop _____ soon, we won’t buy this kind of shoes. Shall we go shopping this afternoon?
---OK, can’t agree more.
| A．has closed down | B．is closing down |
| C．closed down | D．will close down |
He wondered if he could slip out of the lecture hall without anyone______.
| A．noticing | B．noticed | C．to notice | D．being noticed |
We cannot figure out ____quite a number of insects, birds, and animals are dying out.
| A．that | B．as | C．why | D．when |
We have been told that under no circumstances_______ the office telephone for personal affairs.
| A．may we use | B．we can use | C．we could use | D．did we use |