I fell asleep while working on this paper ______ the computer on．
| A．as | B．for | C．over | D．with |
There are still many problem ahead of us, but by this time next year we can see light at the end of the ________.
| A．battle | B．day | C．road | D．tunnel |
I went there in 1984, and that was the merely occasion when I ________ the journey in exactly two days.
| A．must take | B．must have made | C．was able to make | D．could take |
Thecouple________theiroldhouseandsolditforavastprofit.
| A．didfor | B．didin | C．didwith | D．didup |
The priest made the ________ of the cross when he entered the church.
| A．mark | B．signal | C．sign | D．gesture |
On account of fuel supplies being finite and many people being wasteful, we will have to install ________ solar heating device in our home.
| A．some type of a | B．some types of a | C．some type of | D．some types of |