Growing population resulted in growing rubbish.—There is ______that rubbish will become the major threat to human beings in future.

Dr. Black is a professor of chemistry._______, he is a famous writer.

Would you mind _____ in the bus – Of course not.

14 —- Is it Tom that playing basketball—- It __________ be him He is so crazyabout basketball

I can’t remember _______ made the teacher give Mary the permission to leave the class earlier.[ ]