He blamed his poor performance_____jet lag.

It is important to ________ your skin from the harmful strong sunlight.

The book fair has received a positive ________ from readers.

Students should_____their own interests as well as do their schoolwork.

Water is composed _______ hydrogen and oxygen.

It took me a month to get rid _______ the cough.

_______ for your laziness，you could have finished the assignment by now.

Jenny complained that the hospital ________ her too much for the treatment.

We_____knowledge from our families,schools,jobs,and the mass media.

At any rate I did not succeed _______ myself understood by you.