They have discussed for several years of drafting a new law to control the pollution, but when it will be is still unknown.

The number of the students in our class ________ forty-eight. A number of them ________ to school on foot.

You should tell ________ possible to support yourideas.

There are plenty of jobs ______ in the western part of r country.[ ]

(2013·高考辽宁卷)He was unhappy when he sold his guitar.After all，he ________it for a very long time