With the loud noise going on in the workshop, I can hardly on my lessons．
| A．put | B．rely | C．concentrate | D．center |
It ______ a Saturday afternoon in May ______ Margaret could arrange for me to meet her elder sister.
| A．was until; when | B．was until; that |
| C．was not until； when | D．was not until； that |
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 |