Mrs.Smithlockedboththefrontandthebackdoorsbeforeshewenttobed______thatsomeonemightstealintothehouseatnight.
A、so
B、forfear
C、unless
D、oncondition
_____youunderstandthisrule，you‘llhavenodifficultyindealingwithsuchproblems.
A、While
B、Though
C、Unless
D、Once
Theyshouldtryto________theirusualinhibitionsandjoininthefun.
A、sendoff
B、layaside
C、taketo
D、turnoff
Thedriverpulled_____atthetrafficlights.
A、in
B、off
C、up
D、out
Lookatthisgroupofpeople______beachvolleyball.
A、played
B、isplayed
C、playing
D、isplaying