A: Listen! Is it Tina singing in the next room?B: No, it __________ be her. She is still in Shanghai.
While the alien _______ a souvenir, the girl called the police.
I think _________ necessary for students to take an interest in all subjects.
Lanmon _________ here for almost ten years and he has many Chinese friends.
If everyone pours less polluted water into Dianchi Lake, it will be _______.
It’s raining outside! Put on your raincoat, ________ you’ll get wet.