题目内容
选择并抄写单词。
They ________(existed, were existed)long ago．
选择并抄写单词
Don't forget to switch off the lights and fans ________(before; after)you leave the classroom．
Don't ________(be; do)late for class again．
Don't play the CD too loudly．It's much too ________(noise; noisy)．
Don't ________(drop; throw)any litter．Put it in the bin, please．
Don't keep me ________(waiting, look)for a long time here．
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