—Oh, it's so cold. We haven't had such a severe winter for so long, _______ we?—Yes, the forecast says it's going to get worse _______ it warms up.
Helen ______ her keys in the office so she had to wait until her husband ______ home.
The teacher, with 6 girls and 8 boys of her class, ______ visiting a museum when the earthquake struck.
With a lot of difficult problems ______, the newly-elected president is having a hard time.
—I must apologize for ______ ahead of time. —That’s all right.
------ I missed the bus. What a pity ! ------______. There will be another one in five minutes.