You should the new words when you don’t know how to spell them.
| A．look for | B．look up |
| C．look after | D．look down |
--- The population of China is really large!
--- __________ We should take measures to control it.
A. So it is.
B. So he is
C. So is it..
--- Why should we plant more trees to protect the environment?
--- Because trees can stop the wind from ________ the earth _________.
A. washing ;away
B. blowing; away
C. changing ;into
--- Have you found your lost book_____?
--- No, I haven’t.
A. already B. yet C. Still
Because of the 2008 Olympic, great changes have _________ in Beijing.
A. taken place B. improved C. happened
Don’t give up, __________ you will succeed one day.
A. or B. but C. And