It took a long time for the effective use of natural gas_________．
| A．to be made | B．to make | C．being made | D．making |
It was not until midnight _________ they reached the camp site.
| A．that | B．when | C．while | D．as |
— Did you meet with the famous space hero?
— ___________ I had come here earlier.
| A．If only | B．If not | C．But for | D．For fear |
The committee ______ five famous scientists put forward a valuable plan at the end of conference.
| A．was made up | B．was made from | C．made from | D．made up of |
They suggested that the library ________ open during the vacation.
| A．was kept | B．would be kept | C．is kept | D．be kept |
If I can help________, I don’t like to working late into the night.
| A．so | B．that | C．it | D．them |