. I still remember the day ________ we first met on.
The traffic problems we are looking forward to seeing ______ have attracted the government's attention.
| A．solving | B．solve |
| C．solved | D．to solve |
—Who ______ it be that hasn't handed in his homework?
—It ______ be Bob. He handed it in yesterday.
| A．can; mustn't | B．must; can |
| C．can; can't | D．may; must |
Only those who have experienced hardship ______ well aware of what happiness means.
| A．can they be | B．they can be |
| C．can be | D．they can |
Even on a cold day he prefers ______ out to play football ______ at home.
| A．going; rather stay |
| B．going; to staying |
| C．to go; rather than staying |
| D．to go； rather than to stay |
It was unwise of him to ______ the unreliable data in his speech.
| A．refer to | B．add to |
| C．belong to | D．point to |