He is _____ unusual writer. He can write _____ useful book.

ecided to risk looking for a place to stay where he arrived, rather than booking ______.

______ there was no bandage available, she tore off her sleeve and tied it around his wrist a little above the bleeding point ______ him from losing too much blood.[ ]

Isn’t it hard to drive downtown to work?—Yes，that’s why I________to work by train

We believe scientists will a way to solve the problem of air pollution.