Students should be encouraged to use________Internet as________resource.

Kate’s room isn’t_______, her books are everywhere.

Mr. Black is a careful and experienfed engineer, so he is often _____ to finish some challenging tasks.

I think students should have mobile phones to calltheir parents.—_____. They often use them to play games instead.

Can we ask Jeff for help with our English? — You’d better not. He is thelast person _______ others.