— Attention, please. The plane has to be _____ because of the heavy rain.— Oh, bad luck! We have to wait now.
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.