1 . — Come and join us, Ben!
— I’m afraid I can’t. I’m too busy now. If I        time, I would certainly go.

A．had

B．will have

C．have had

D．have

2 . We _______ home now if you hadn’t taken the wrong turning.

A．would be	B．are
C．were	D．will be

3 . Your English______ much better now if you had taken the teacher’s advice.

A．would be

B．would have been

C．will be

D．should be

4 . If you _______hard then, you ______ in the comfortable officer now.

A．had studied; would be sitting

B．study; are sitting

C．have studied; would be sitting

D．studied; are sitting

5 . If   Masaccio ______alive, he ______be amazed at how artists paint today.

A．is; was

B．were; could

C．is; can

D．was ; would