—Do you mind my taking this seat?
—_________.
| A．Yes,sit down,please | B．No,of course not |
| C．Yes,take it please | D．No,you can’t take it |
I __________ what he said and I __________ him.
| A．believe ；believe in |
| B．believe in ；believe |
| C．believe ； believe |
| D．believe in ； believe in |
—I wonder why Tom left without a word.
—He __________ have had some trouble, for he looked dull.
| A．should |
| B．must |
| C．can |
| D．could |
I had just got up and was about to cook my breakfast__________ the telephone rang, but it was hung up __________ I could answer it.
| A．while ； when |
| B．when ； as |
| C．as；after |
| D．when；before |
Swimmers must be very strong in order to build up speed because of the high resistance (阻力)of the water. Runners,__________, must struggle against the heavy resistance of the air and ground.
| A．generally |
| B．similarly |
| C．naturally |
| D．probably |
They're not playing baseball today __________ the rain.
| A．because |
| B．as |
| C．since |
| D．because of |