| We must do something to stop people from ______. |
A. to throw litter about B. to throw litter into C. throwing litter about D. throwing litter into |
| There are a lot of _______ down there but hardly any _______. |
A. sheeps, people B. sheep, people C. sheeps, peoples D. sheep, peoples |
| Is there in his talk? |
A. something difficult B. difficult something C. difficult anything D. anything difficult |
| They here since they to China. |
A. have lived, come B. have lived, comes C. have lived, came D. lived, came |