－Mr. Li, can you tell me how to do better in the exams－I think you should read and write as _________ as possible during the exams.

ving worked out the problem, _____leave the office．

Government reports, legal papers and most business letters are the main situations ____ English is used[ ]

.It is _____that he has been addicted to the drugs and has difficulty quitting it.

So thatall the living things are dying out gradually .