Some researchers believe that there is no doubt ______ a cure for AIDS will be found.
| A．which | B．that | C．what | D．whether |
I am sure your parents are proud __________ you.
| A．of | B．in |
| C．up | D．to |
—Are you used to __________ in the north with the old couples?
—Yes, I am glad to find out that coal is used __________ electricity for home use.
| A．live; to produce | B．living; to produce |
| C．to live; produce | D．living; producing |
__________ be late for the first class, Bill took a taxi instead of riding to school that morning.
| A．In order not to | B．So as not to |
| C．In order to not | D．So as to not |
—Bob, are you free at the moment? I have to ask you some questions.
— __________.
| A．It's a pleasure | B．Ask, please |
| C．Help yourself | D．Yes, go ahead. |
You are __________ to hand your paper in before the class is over.
| A．expected | B．supposed |
| C．forbidden | D．permitted |