Noise is unpleasant, _____ when you are trying to sleep[ ]

So far a total of 19 cases______ andanother 36 people are being treated on the assumption that they are infectedwith Legionnaires Disease.

______ do you improve your listening skills — I improve it _______ listening to tapes.

The soldiers put up a strong________in order to protect their country

There are two buildings in our new school, ________ stands nearly a hundred feet high.