Please ________ look outside. Look at the blackboard.
A. not
B. don’t
C. aren’t
D. can’t
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________ climb the tree. It is dangerous.
A. Doesn’t
B. Not
C. Don’t
D. Isn’t
________ me your driving license, please.
A. Show
B. To show
C. Showing
D. Showed
We are at the library . Please ________ quiet .
A. do
B. be
C. can
D. are
基于物理学中,三角形具有稳定性这一原理,衍生出攀岩的()平衡。