----Have you finished your homework?
-----No, I ________ my younger sister all day yesterday.
| A．was looking after | B．would look after |
| C．had looked after | D．look after |
If you to see Mary, what would you tell her?
| A．are |
| B．will be going |
| C．must |
| D．were |
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 |