_____ not to miss the flight at 15:20. the manager set out for the airport in a hurry.
______ twice a year,whether it is a car or a truck,is the rule that every driver must obey in this city.
—Please ______ us in the discussion. —I'd like to,but I'm ______busy at the moment.
—Johnson,come and look at the sea!It's beautiful,isn't it? —Absolutely!If only I ______here by the sea.
It is you as well as your wife that ______ your son's bad performance at school.
These problems,______ will seriously affect the growth of teenagers and even the nation's future.