You’d better put on a heavy coat.Sometimes it________be very cold here at night.

The problem is too difficult for him. He _______ solve it by himself without any help.

—What qualities does a person need to become an astronaut?—He ________be knowledgeable，independent and creative.

---____, sir, how can I get to the nearest bank?-- You can ________ a No 2 bus at the station..

 — Are you going to Beijing by air?— It’s fast, but expensive. So I’m not sure. I _____ take a train.