18．_________a US visitor visa twice, the old couple finally gave up their hope of going to America to experience Thanksgiving Day.
| A．Having been refused | B．Being refused | C．Having refused | D．To be refused |
_____ some of this juice — perhaps you will like it.
| A．Try | B．Trying |
| C．To try | D．To have tried |
_____ down the radio — the baby’s asleep in the next room.
| A．Turn | B．Turning |
| C．to turn | D．To have turned |
_____ it with me and I’ll see what I can do.
| A．Leave | B．Leaving |
| C．If you leave | D．When left |
_____ through this book and tell me what you think of it.
| A．Look | B．Looking |
| C．To look | D．Having looked |
_____ me, and then try to copy what I do.
| A．Watch | B．Watching |
| C．To watch | D．Have watching |