He died suddenly , ________ three kids.
A. leave
B. left
C. leaving
D. had left
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When ______ for a formal meal, you should dress smartly.
A. invites
B. invited
C. invite
D. inviting
_______ you’re a policeman, you should have the responsibility to protect citizens.
Although
B. Therefore
C. Though
D. Since
He acts as if he __________ me.
A. known
B. know
C. knew
D. knows
She talked about Tibet as if she ________ there before.
A. been
B. had been
C. has been
D. was