8. As soon as the floodwater ___________ down, people ____________ their houses.
A. went - cleaned                              B. had gone – cleaned   
C. went - had cleaned                        D. had gone – had cleaned
9. If I were you, I …  do something to prevent him from littering.
A. would                        B. did                              C. will                 D. do
10.Earth … by the gravity of the Sun and orbits around it.
A. holds                         B. is held                        C. is holding                  D. held
 
Câu 5: Choose the best answer
1. If he _____________ her, she could have an accident.
A. didn’t warn     B. hadn’t warned           C. warned                      D. doesn’t warn
 
2. If I were you, I_____________ that camera.
A. won’t buy                 B. wouldn’t buy   C. didn’t buy                 D. haven’t bought
3. If I were the Minister of Education, I _____________more money on teachers.
A. spent               B. would spend              C. will spend                  D. have spent
4. If I_____________ here, I’d like to be in Paris.       
A. am not             B. weren’t                      C. hadn’t been               D. haven’t been