The old man is weak, so he has to use a ______ stick to support him.
A. walk
B. to walk
C. walking
D. walked
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The doctor suggests________two vitamin pills after meals.
A. to have
B. have
C. had
D. having
He tried to avoid_______my questions.
A. answer
B. to answer
C. answered
D. answering
His habit is getting up early______ .
A. without breakfast
B. without the breakfast
C. without dinner
D. without nothing
My father was a_______piano player.
A. self-teach
B. self-teaching
C. self-to teach
D. self-taught