—Why are you looking so disappointed, Ken?—The outdoor concert _______ for tomorrow will be put off.
18. –May I use your pen? --________!
17. Can you lend me the book ________ the other day?
16. I ________ an invitation from one of my friends, but I have no idea ________ it or not.
15. He ________ his doctor’s care ________ he is quite well again.
14. Yesterday we went to a park ________ is newly built, ________ we had a very good time.