The key got ________in the lock and we had to ask a repairman to help.
Let us not waste ______ time we have left .
Do you consider it any good _____ the truck again ?
It's nearly seven o'clock . Jack _____ be here at any moment .
If you _____ stop smoking , you can only expect to have a bad cough .
.—Must I turn off the gas after cooking ? --Of course . You can never be ___ careful with that.