—It’s such a beautiful day． Why not have a picnic with us?
—_____． But I have a lot of homework to do．
| A．Don’t mention it | B．It’s up to you |
| C．I have no time | D．I’d love to |
The young man insisted that he _________ nothing wrong and __________ free.
| A．did, set | B．had done, must be set |
| C．do, be set | D．had done, should be set |
When first __________ to the market, the computer software was not a success due to its complexity in operation.
| A．introducing | B．being introduced |
| C．introduced | D．to be introduced |
It’s certainly been a long time _________ we met last time.
| A．that | B．before | C．until | D．since |
Unfortunately, the element Madam Curie devoted all her life her death.
| A．to caused | B．causing | C．to be caused | D．to causing |
Out of the crowded bus , who was dressed in a black suit and waved to a woman.
| A．a tall man stepped | B．stepped a tall man |
| C．did a tall man step | D．did a tall man stepped |