a walk after supper is certainlygood for the old people, but it remains ______ whether they will enjoy it.

When he was working there he caught a serious illness from _____ efforts he still suffers.

One or two days ____quite enough to complete the work. ___ you or he going to work with me?

have you been —I got caught in traffic, otherwise I_______ here earlier.

Why don’t you _____ your teacherfor help when you can’t finish _____ it by yourself