卧推过程中不要把、和臀部拱起或憋气,这样会使肌肉失去控制,是危险的。
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About60percentofthestudents_____fromthesouth,therestofthem_____fromthenorthandforeigncountries
A. are: is
B. are:are
C. is:are
D. are:am
Halfoftheworkershere_____under30_____.
A. is:years
B. are;yearold
C. is;yearsold
D. are;yearsold
Theaudience_____solargethatnoseatwasleftunoccupiedinthegreathall
A. is
B. are
C. was
D. has
Thesecretaryandprincipal_____atthemeetingnow
A. arespeaking
B. isSpeaking
C. weremakingaspeech
D. haveaspeech