21. Whether you believe what he said _________ what he does in the future.
| A．lives on | B．depends on | C．calls on | D．carries on |
If the sea to rise 50 feet, India would become an island.
| A．will |
| B．is |
| C．are |
| D．were |
If you hadn’t gone with Tom to the party last night, .
| A．you would meet John already |
| B．you won’t have missed John |
| C．you will have met John |
| D．you would have met John |
I it to him if he didn’t understand.
| A．shall explain |
| B．will explain |
| C．would explain |
| D．explain |
I would ask George to lend us the money if I him.
| A．had known |
| B．knew |
| C．have known |
| D．know |
_ your help, we’d never have been able to get out of trouble.
| A．Had it not been |
| B．If it was not |
| C．If we had not been |
| D．If there has not been |