Question 4. If you don’t work harder, you _______successful.

A. wouldn’t be

B. couldn’t be

C. not be

D. won’t be

Question 5. If Mary ________ here now, she would help me to solve this problem

A. was

B. has been

C. is

D. would be

Question 6. I think this test _________ than the one we did last month.

A. as difficult

B. more difficult

C. the most difficult

D. difficult