4. If we go on talking, we _________ punished.

A. would be

B. will be

C. could be

D. could have been

5. Sarah has to stay in bed for a few days _________ she is sick.

A. because      

B. and

C. but

D. although

6. Vietnamese people are very _________.

A. friend

B. friendliness

C. friendly

D. friendship