We need to work faster because time is _____.
| A．of the essence | B．of the importance |
| C．limitless | D．countless |
Great changes___ have taken place _____ in the city, and a lot of factories________.
| A．have been taken place; have been set up |
| B．have taken place; have been set up |
| C．have taken place; have set up |
| D．were taken place; were set up |
He wrote a lot of novels，none of________was translated into a foreign language.
| A．them | B．what | C．that | D．which |
-Can you help me with the maths homework, mom?
-You can't always ________others' help for your homework.Do it by yourself this time, dear.
| A．wait on | B．rely on | C．insist on | D．turn on |
I________through that bitter period without your generous help.
| A．couldn't have gone | B．didn't go |
| C．wouldn't go | D．hadn't gone |
These old pictures bring to their mind the college days ________ they spent together, ________ life was hard but happy.
| A．when; whose | B．which; whose |
| C．which; when | D．when; which |