My mother is ill. I _______ stay at home to take care of her.
| A．can | B．may | C．have to | D．maybe |
We________four thousand new words by the end of last year．
| A．learned |
| B．had learned |
| C．have learned |
| D．will learn |
—Did you meet Tom at the airport?
—No．His plane________by the time I________there．
| A．has taken off；got |
| B．took off；had got |
| C．took off；arrived |
| D．had taken off；arrived |
I will not leave you alone．________I go，I will take you along．
| A．Wherever |
| B．Whatever |
| C．Whoever |
| D．However |
The________he learns，the________knowledgeable he will be．
| A．more；more |
| B．more；less |
| C．most；most |
| D．most；least |
I found it boring________the lecture．I nearly fell asleep．
| A．listening to |
| B．to listen to |
| C．listen to |
| D．listened to |