_____ computers are convenient to us in daily life, it may also cause other problems.
| A．Whether | B．Because | C．As | D．While |
all kinds of difficulties，the workers have made rapid progress in the construction of
the World Expo 2010 Shanghai．
| A．With | B．For | C．Under | D．Beyond |
—Bob! How’s your project? I heard you started it last Friday，right?
—Oh！I__________for it．But I haven’t decided when to do it．
| A．have prepared | B．had prepared |
| C．have been preparing | D．was preparing |
a diary every day and you’ll improve your writing．
| A．Keeping | B．To keep | C．Keep | D．If you keep |
_____ in the queue for half an hour,Tom suddenly realized that he had left his wallet at home.
| A．To wait | B．Have waited | C．Having waited | D．To have waited |
The library needs _____,but it’ll have to wait until Friday.
| A．cleaning | B．to clean | C．being cleaned | D．to being cleaned |