I'll go to visit my aunt in England _____ the summer holidays start.
A.while
B.since
C.until
D.as soon as
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一Are you going camping this afternoon?-A typhoon is coming I'm not sure _______the road to the mountains will be closed.()
A.which
B.what
C.whether
D.why
We have been expecting Rio 2016 Olympics_______ the Olympic flame(圣火) was lit.
A.if
B.unless
C.since
D.though
Our Chinese teacher didn't go to bed______ he finished his work last night.
A.if
B.until
C.since
D.because
It's a good habit to wash your hands ________ you have meals.
A.unless
B.while
C.when
D.before