Tourism, _______ it brings in money to a country, can also result in damage to the World Heritage sites there．
| A．once | B．while | C．if | D．as |
“Do you have a laptop?” “Yes, I have .”
| A．it | B．one | C．that | D．a |
The airplane leaves at 7:00 p.m. So I have to be at the airport 5:40 p. m. at the latest.
| A．by | B．after | C．until | D．in |
Your performance in the exam isn’t that satisfactory. , you failed.
| A．In a word | B．In other words | C．What’s worse | D．What a pity |
--- I to your birthday party last Sunday.
--- Unfortunately, you were out on business.
| A．had come | B．came | C．would come | D．would have come |
He can’t be at home now, for I saw him in the gym just now.
| A．giving out | B．working out | C．carrying out | D．bringing out |