According to a recent ______ , more teens than ever aren't getting enough sleep because they spend more time on phones.
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I have a terrible headache. And the doctor tells me to take a(n) ______ rest.
The main ______ of online shopping is being able to buy things at any place we want.
Some children find it difficult to pay ______ to their shcoolwork.
【单选题】组合体的尺寸有定形尺寸、定位尺寸和()尺寸。
A. 形状
B. 大小
C. 总体
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