He____know the answer, but I’m not sure.
A. maybe B. may be C:may D. must
—Miss Li, are we going to have a picnic tomorrow?
—Yes. But if it ______, we’ll do some reading instead.
| A．will rain | B．rains |
| C．is raining | D．rained |
— “Frog”, Mo Yan's latest novel（小说）, please!
— Sorry, it ________ just now. But it will come out again soon.
| A．sold out | B．is sold out |
| C．has sold out | D．was sold out |
—Is that boy Alan?
—No, it ______ be him. He left for Beijing yesterday.
| A．can’t | B．shouldn’t |
| C．needn’t | D．mustn’t |
—Have you heard about the airplane accident?
—Yes, all of the passengers on the plane lost their___________.
| A．money | B．time |
| C．interest | D．lives |
—_______ do you go to see your grandparents?
—Once a week.
| A．How far | B．How long |
| C．How often | D．How soon |