The boy ________ his book here and forgot ________ it home.
| A．left, took | B．left, to take | C．forgot, brought | D．forgot, to bring |
—Have you _____ had dumplings?
—No, not _____.
| A．ever; yet | B．ever; ever | C．yet; yet | D．yet; ever |
The shoes were worn out, what’s more, they aren’t worth _____.
| A．to mend | B．mending | C．mended | D．for mending |
— What's the population ____ the U.S.A?
— The U.S.A has ____ population of 297 million.
| A．of…a | B．of… /, | C．in…a | D．in … some |
We should plant more trees on ____ sides of the street.
| A．either | B．both | C．all | D．each |
---What are you going to do next weekend?
---I _____ yet. Do you have any good ideas?
| A．haven't decided | B．won't decide |
| C．have decided | D．didn't decide |