The mother looks upset outside the operating room, whose son _________ on.
I have to go to school by bus because my bicycle _____.
The course books are _____ by four tapes, which are beneficial to beginners.
— I’m afraid what I did cannot satisfy your requirements.— _____. At least you tried.
While _____ music is just so-so, _____ story in this TV play is quite moving.
The user also wears special gloves to ‘touch’ the people and objects _______ he or she sees.