He is, however, one of those restless people who never ___ content with their present environment.

Where was your dad at this time last night—He was talking with my uncle I was looking for some information on the Internet.

________ the present unemployment continue, the society would face a more troublesome situation.

Everything he ________ away from him before he returned to China.

Listen ! Peter is singing in the classroom . It _____ be him . He has gone back to his hometown .