energy，turn off the water when you are brushing your teeth．
A．Save B．Saving C．Saved D．To save
一I want to borrow the book，but I don’t know how long it may .
一For two weeks．
A．keep B．be borrowed C．borrow D.be kept
一Oh，there’s someone knocking at the door．
一 must be that naughty boy.
A．H e B．This C．It D．That
We use mobile phones when the plane takes off．
A．may not B．should n’t
C．need n’t D．must n’t
一What do you think of our performance on the charity show?
一Wonderful !I don’t think I can see a one·
A．bad B．worse C．good D·better
一Why were n’t you at the meeting?
一I for a long distance call from my sister in America·
A．waited B．was waiting
C．have waited D．had waited
