----Look,Mr.Hu is on the other side of the street. ----It____ be him.He has gone to Lanzhou.
E-mail, as well as telephones, _______an important part in our daily communication.
If you make every effort, your dream will ____, and this ____ all the people.
Had Tom studied harder, he ________ the exam.
Adam and Max hardly knew what to talk about: they had so little ________.
______ the assignment said above, you have to write a 200-word composition on environment pollution.