At the beginning of class, the noise of desks __________ could be heard outside the classroom.
| A．opened and closed | B．to be opened and closed |
| C．being opened and closed | D．to open and close |
Internet shopping is really ____ when people are sure of its safety and security.
| A．taking off | B．taking up | C．setting off | D．setting up |
What the young man can’ t ____ is that his mum always treats him like a baby.
| A．support | B．undertake | C．hold | D．bear |
____ the news, so far, has been good, there may be bad days ahead.
| A．When | B．While | C．If | D．As |
Not until the train pulled into the next station ____ her suitcase gone.
| A．Mary had found | B．had Mary found | C．did Mary find | D．Mary found |
Since 1994, the glacier in Antarctica has lowered by as much as 90cm, ____sea level to rise.
| A．having caused | B．causing | C．caused | D．being caused |