Choose the best option (a b c or d) to complete these sentences

choose the best option (a b c or d) to complete these sentences
1.you.........bush your teeth after meals
A.shouldn't                 B.should             C.would             D.might
2.............. it rained,they went camping with their friends
A.although                 B.because           C.if                   D.however
3...............they performing folk dances
A.do      B.will C.are D.did
4we celebrate..........in the middle of the eight lunar month
A.mid-autumn festival B.easter C.christmas D.gatherings
5.my sister.........her homework right now
A.is doing B.dose C.are doing D.do
6.when you see the sign'' .............'' you mustn't turn left here
A.no left turn B.turn right C.walking only D.school ahaed