______ it is the first choice of many young travelers, Europe is also seen as a wonderful tourist attraction by many old people.
| A．While | B．Unless | C．Once | D．Until |
—I’ve studied growing plants as one of my interests. Could I make some suggestions?
—___________.
| A．You will make it | B．Go right ahead |
| C．Don’t mention it | D．Take it easy |
His illness _____ his absence.
| A．showed | B．accounts for | C．explains | D．gives out |
You’ve been so kind to us that we will always be deeply _____.
| A．out of debt | B．in your debt | C．in trouble | D．in danger |
—Mr. Green was born in China.
—It’s no _____ he can speak Chinese so well.
matter B. doubt C. wonder D. problem
The meeting was to have started at nine o’clock, but the chairman had not _____ by ten.
| A．turned up | B．turned down | C．turned out | D．turned off |