is, are, was, were, will be, are going to be, have, has, had The beautiful ________ something that the innocent ________ not always able to appreciate fully.
is、are
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He ________ violin when I want to sleep.
When ________ to tell the difference between British and American English, the linguist made a long and ________ speech.
Thetwinshadbeenawayforsuchalongtimethatmanypeopleinthevillagethoughtthey________.