How long do you think_________Obama officially takes office in the White House?
| A．it will be that | B．will it be until |
| C．will it be when | D．it will be before |
_______ in 1636, Harvard is one of the most famous universities in the United States.
| A．Being founded | B．It was founded |
| C．Founded | D．Founding |
_______ time, he’ll make a first-class tennis player.
| A．Having given | B．To give |
| C．Giving | D．Given |
Remember _______ off the light when _______ to bed.
| A．turning, going | B．to turn, to go |
| C．turning, to go | D．to turn, going |
Stop _______ me to hurry up. I can only go so fast.
| A．to tell | B．telling |
| C．to have told | D．having told |
Certainly I posted your letter — I remember ______ it.
| A．posting | B．to post |
| C．to be posting | D．have posted |