The door opened and in we had never seen before.
| A．did a tall man come |
| B．a tall man did come |
| C．came a tall man |
| D．a tall man came |
---Shall we go to the art exhibition right now?
--- ____________.
| A．It’s your opinion | B．I don’t mind |
| C．It’s all up to you | D．That is your decision |
—He failed in the exam again.
—He __________his teacher’s advice.
| A．should not have followed | B．should not follow |
| C．mustn’t follow | D．should have followed |
When first to the market, these products enjoy great success.
| A．introducing | B．introduced | C．introduce | D．being introduced |
It is uncertain ______ side effect the medicine will bring about, although about two thousand patients have taken it.
| A．what | B．that | C．how | D．whether |
The English in the future will be quite different from the English of today. It is possible that some English words may even ________ completely.
| A．die down | B．die out | C．die off | D．die of |