题目内容

1.麻醉分（）、（）和（）3类。

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____________on for 3 hours in the night will make it hard for you to fucus on a lecture the next morning.

A. Party
B. Partying
C. Parted
D. Parting

Keep__________until you find what works for you and stick to it.

A. trying
B. waiting
C. tried
D. waited

Setting aside enough time for study is a__________for every student.

A. must to
B. must do
C. must dos
D. must-do

___________hard means you may have to play hard sometimes.

A. Working
B. Work
C. Worked
D. Being worked