He is quite strange, for everything he does is opposite to ______ is considered normal behavior

15 With the development of West China, many technicians are _____ needed there in recent years

How did you ________ the old valuable house—It used to be ________ my uncle. He left it to me inhis will.

I’ll go and see you whenever _______.

There are some dangerous fishes in this river, and I’ve warned Tom here.