桱ohn，will you please ______ the blackboard now? It's your duty．

　　桹K．

　　A．not clean　　 B．not to clean　 C．to clean　　 D．clean

桵ary，do you like to visit the Science Museum with me?

　　梍_____，but surfing the net seems more interesting．

　　A．I'd love to　　

　 B．That's it

　　C．You're welcome

　　D．No problem

If we all make a contribution to _____ the environment，the world will become much more beautiful．

　　A．protecting　　B．protected　　C．protect　　 D．protects

He was ______ sad at the bad news that he could hardly say a word．

　　A．very　　 B．so　　 C．too　　 D．much

She prefers to offer more for a better TV set ______ less for this one．

　　A．rather than pay　　

　　B．to pay

　　C．not to pay　　　　

　　D．to paying

In some places there are watch towers on the beaches to ______ people about sharks in the water．

　　A．prevent　　B．allow　　C．warn　　 D．advise

Today the forests have almost gone．People must ______ down too many trees．

　　A．stop from cutting　　　　

　　B．stop to cut

　　C．be stopped from cutting

　　D．be stopped to cut

桰 feel tired and sleepy．

　　梂hy not stop ______?

　　A．to relax　　 B．relaxing　　 C．resting　　 D．relax

Li Lei was ill．Some of us ____ him to hospital last night．

　　A．brought　　B．got　　C．took　　D．carried

____ the meeting，John came up and introduced himself．

　A．At the end of　　B．On the end of　　C．At the end D．On the end