It is our duty ______much attention to ________ our best to keep our city clean.
| A．to pay, trying | B．paying, trying |
| C．pay, try | D．to pay, try |
If it ________ rain tomorrow, we’ll go to the zoo.
| A．won’t | B．doesn’t | C．don’t | D．isn’t |
—I need some money. What should I do?
—You should ________ some ________ your friends.
| A．borrows, to | B．lend, to | C．ask, for | D．borrow, from |
—Do you get ________ well ________ your neighbors?
—Yes, we do.
| A．on, to | B．in, with | C．in, to | D．on, with |
My brother has been teaching ________ he was 21 years old.
| A．when | B．if | C．for | D．since |
While the alien ________ the museum, the boy called the TV station.
| A．visiting | B．was visiting | C．visited | D．visit |