154. Using renewable energy is a simple idea, but ______ we find it hard to put into practice.
| A．one | B．what | C．which | D．That |
We can't _____ one to change the habits of a lifetime in a short time.
| A．hope | B．wait | C．expect | D．imagine |
It was necessary to _____ the factory building as the company was doing more and more business.
| A．extend | B．increase | C．lengthen | D．magnify |
. I asked the tailor to make a small _____ to my trousers because they were too long.
| A．change | B．variation | C．revision | D．alteration |
Because of the strong sun Mrs. William's new dining room curtains _____ from dark blue to gray within a year.
| A．faded | B．fainted | C．paled | D．diminished |
. Jack is good, kind, hard-working and intelligent. _____, I can't speak too highly of him.
| A．As a result | B．By the way |
| C．On the whole | D．In a word |