If certain species _____ extinct, an expert in New York, says there would be enough resources to reintroduced them in the future.
| A．had become | B．would become |
| C．are becoming | D．should become |
_______, my heart ______.
| A．On hearing the sad news, sank | B．Hearing the sad news, dropped |
| C．At the sad news, fell | D．When I heard the sad news, sank |
Mr. Smith suggested the problem worth paying attention ______ at the meeting.
| A．to be discussed | B．to being discussed | C．being discussed | D．be discussed |
The advice is of great ________ to our work. We all think it ________.
| A．uses, good | B．useless, bad | C．use, good | D．useful, fine |
—The English exam is not difficult, is it?
—______. Even Tom ______ to the top students failed in it.
| A．Yes; belongs | B．No; belonged | C．Yes; belonging | D．No; belonging |
I ____ talking to you. You never listen to me.
| A．feed up with | B．feed on | C．am fed up with | D．am fed up of |