It took a long time for the effective use of natural gas_________．
| A．to be made | B．to make | C．being made | D．making |
The old man needs _________ .
| A．looking after | B．being looked after | C．to look after | D．look after |
I think all the workers, ________ the leader _____ playing the most important role.
| A．rather than ; are | B．rather ; are |
| C．more than ; is | D．less than ; is |
He _____ a carpet on the floor and then _____ on it.
| A．lied ; lay | B．lay ; laid | C．laid ; lay | D．lain ; layed |
School children must be taught how to deal with dangerous_________ .
| A．states | B．conditions | C．positions | D．situations |
It was foolish of him to _______his note during that important test, and as a result, he got punished.
| A．stick to | B．point to | C．refer to | D．keep to |