—Do you often help your brother with his English?—No. He learns English by ________.
He met many problems he was going over his lessons.
--Where does your uncle work, Tom ? --He is in a hospital he works as a doctor.
In our school library there a number of books on science and the number of them growing larger and larger.
A lot of traffic was kept from going into the city centre the heavy snow?
--What about finding out Alice is going to Hefei ? --I’m afraid her friends have told her Hefei has many places of great interest.