The look on his face suggested that he just happened _______ the secret and _______ he himself was very shocked, too.
Tracy wanted to be ______ of her parents after graduation, and tried to live alone.
— You have to believe in yourself. No one else will, if you don't. — __________. Confidence is really important.
I am concerned __________ it that I can't concentrate __________ my work because of headache.
His daughter couldn't concentrate __________ her studies with all that noise going on.
Mr. Bill Clinton was elected __________ President of the United States in __________ 1990s.