Vivian will take her daughter to the amusement park________she gets the tickets．
A.if B.until C.although D.unless
Which club do you prefer to join，the chess club________the dancing club？
A.so B.but C.or D.for
—Tom，________here to carry the luggage upstairs for me，will you？ —All right．
A.come B.came C.coming D.to come
According to the traffic law，children under 12________ride bicycles on the road．
A.won't B.wouldn't C.needn't D.mustn't
Doctors tell us________our hands before and after every meal．
A.wash B.washed C.washing D.to wash
The engineers will keep________the project with the manager of the company．
A.discuss B.discussed C.discussing D.to discuss
