There is a natural phenomenon scientists call the greenhouse effect.
| A．that | B．what | C．for which | D．who |
The girl went to have piano lessons at the training center with her sister she would stay for an hour.
| A．who | B．where | C．which | D．what |
Cheer up! Everyone may have periods in their lives everything seems tough．
| A．which | B．where | C．when | D．that |
Let's find a place we can wait out the snowstorm．
| A．where | B．which | C．what | D．when |
Barack Obama delivered a speech to 500 local youths during his visit to China，many of were from Fudan University and Tongji University．
| A．them | B．whom | C．which | D．those |
I shall never forget the days ________ I spent in Beijing University, ________ has a great effect on my life.
| A．that; which | B．which; that | C．when; that | D．when; which |
The man ______ talked to you just now is an engineer.
| A．who | B．whose | C．which | D．what |
All ______ we need is to be supplied with food and clothing.
| A．what | B．that | C．which | D．whom |
The police are looking for the witnesses,__________ words will make a difference to the victim.
| A．whose | B．which | C．where | D．when |
Young people who have got jobs may realize university lessons can’t be the only preparation for all the situations _______ appear in the working world.
| A．where | B．when | C．that | D．what |
As is recorded in history, silkworms (蚕) were first raised by a woman in _____ is today Hebei Province.
| A．where | B．the place | C．which | D．what |
Do you still remember the year _________ China became a member of WTO?
| A．that | B．which | C．when | D．what |
We went to the Lincoln Memorial yesterday, ___, not surprisingly, was crowded with visitors from all over the world.
| A．where | B．which | C．that | D．when |
The reason _____ he was driving his car so fast was _____ he would be late.
| A．because, that | B．why, because |
| C．for which, that | D．that, that |
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