There was such a long queue for coffee at the interval that we _____gave up.
While the police have already done a lot of investigation, much evidence _____.
_____ on everyday practice, progress in English is a goal which can be achieved.
Look out! Keep away from the house, _____ the roof is under repair.
.You’d better get the problem solved as soon as possible ______ it becomes out of control.
—Happy Birthday, Ken! Did you invite Jason? —Yes, but he _____ a meeting in New York otherwise he wouldn’t be absent from my birthday party.