___ the problem of land erosiongetting more serious, the government is searching for a way to deal with it

Did they cut themselves when they were playing with a knife—Yes. __________ of them was careful enough to keep safe．

the theatre with me, willyou—- I should like ______, but I don’t have time

sister is twelve,and isa student.

Mr. Li goes to work ___ bus, but sometimes he ___ the train.