III. Choose the best answer to complete the sentences.
16.We will go on holiday with some friends of _______.
A.our B.ours C.us D.we
17.You (meet) _____ your former teachers at 9 a.m tomorrow morning, won’t you?
A. Do you meet B. Will you meet C. will meet D. meet
18.He (buy) _____ a car two months ago.
A. not buy B. was buying C. buys D. bought
19.They (be) _____ to that supermarket three times.
A. are B. were C. have been D. Will be