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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is, are, has, have, having The average British family, which ________ smaller and richer than 50 years ago, ________ 3. 6 members.
Themanagerfulminatedagainsthissecretary,________surprisedme.
Iappreciate________(give)theopportunitytostudyabroadthreeyearsago.
I only called the police when I ________ everything else.
He________violinwhenIwanttosleep.
