Care should be taken at all times to________the instrument from dust and damp.
John received an invitation to dinner, and with his work ______, he gladly accepted it.
Please tell Tom not to leave the classroom unless he ______ that all the lights ______.
The ticket ______ two people to the party.
When asked by the police, he said that he remembered ______ at the party, but not ______.
—The outing has been put off till next Friday due to the weather. —______