Inmyopinion,theyshoulddosomethingtorewardtheirmost_(produce)employees
A、动量不变，对圆心的角动量不变
B、动量不变，对圆心的角动量改变
C、动量改变，对圆心的角动量不变
D、动量改变，对圆心的角动量改变
We______togotothesupermarketbecausewehadplentyoffood.
A、needn‘t
B、don‘tneed
C、needednot
D、didn‘tneed
Roundthecornerwasabuilding_____windowswereallbroken.
A、withits
B、whose
C、which
D、those
Apersonisluckyifhiscareer________withhisinterestandhobby
A、concerns
B、competes
C、coinciders
D、compares