With the mid-term examination approaching, students should ______ to stay energetic.
He is a very honest official and never _____ any gifts from the people who sought his help.
My camera can be _____ to take pictures in cloudy or sunny conditions.
Mr. Smith gradually _____ a knowledge of the subject.
His new appointment takes _____ from the beginning of next month.
It was a great _____ for him to be pleasant to people he didn't like.