I’m happy ______ should be done has already been done.
I'm afraid I'll have to; my mom is calling me for supper.
To our relief, the patient's condition is __________
I couldn't __________. The line was busy.
They are building the dam in __________ with another firm.
(2012·上海) The club, __________ 25 years ago, is holding a party for past and present members.