________ the prices and functions of different types of computers before you make up your mind which to buy.
| A．To compare | B．Comparing | C．Compared | D．Compare |
______ surprise us most is that she doesn’t even know ______ the difference between the two lies.
| A．What; where | B．All; which |
| C．What; that | D．That; where |
Those chairs _____ the disabled.
| A．are intended to | B．intend for |
| C．intend to | D．are intended for |
Nobody but a few little boys ___ in the garden now.
| A．are playing | B．play | C．plays | D．is playing |
The two companies have reached a partial agreement, but several differences still ___ between them.
| A．happen | B．survive | C．appear | D．exist |
Not until he left home ______ to know _______ important the family was for him.
| A．did he begin; what | B．had he begin; how |
| C．did he begin; how | D．had he begin; what |