Tom is in the book.

nt years, _____ problem of global warming has been very serious.—That’s right. People are facing ____ number of natural disasters now.

It is difficult _____ baby pandas _____ live alone in the wild.

The student, who was ______ to be studying in the classroom, was taken to the police station, which I guess was ______ with the stolen bike.

She often thinks that he will succeed if he works hard，________?[ ]