Helen was very rude to me.I refuse to speak to her again __________ she says sorry.( )
A.untilB.ifC.becauseD.since
I know how busy you are and naturally I wouldn't take ________ too much of your time.
A.offB.upC.onD.down
According to the new traffic rules,people ___________ wear a helmet when riding an e﹣bike.
A.mightB.mayC.canD.must
Football fans are often called the "12th man" because of their influence ______a team.
A.toB.fromC.onD.at
—It is important for us to wear seat belts while driving cars.
—________.( )
A.That's a good ideaB.That's all right
C.I can't agree moreD.Take it easy
—A celebration for the 100th anniversary of the founding of the CPC(中国共产党) will be held,and I'm wondering ________.
—Let's have a discussion about it this afternoon.( )
A.how will we get there
B.which clubs will take part
C.what we could do for it
D.whether can we do something for it