Is this your son's sweater？
No，______ is on the chair behind the desk．（ ）
A．hersB．yoursC．his
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