When seeing Sign _________，we have to drive straight．
一Climate change________mainly by too much CO 2 in the air．
一So I think the key is to produce electricity without creating CO2
A．is caused B．caused C．causes
一A child’s family background brings him or her a bright future．
一Not really . A study shows that reading for pleasure plays a more important _________.
A．part B．game C．joke
一_________beautiful blouse she is wearing!
一But it doesn’t look good against her skin．
A．What B．What a C．How
Since Project Hope started，it _______ millions of children to come back to school
A．has helped B．helped C．is helping
一We don’t have enough money for our field trip .What shall we do?
一The best way_______money is to sell newspapers．
A．raise B． to raise C．raising
