Helen spent three hours ________ the task. She is tired now.
A.complete B.completing C.to complete D.completed
Although my grandma is in her seventies, she is willing ________ new things.
A.learn B.learning C.to learn D.learned
They were required ________ singing before the competition.
A.practice B.practicing C.to practice D.practiced
Can I borrow your bike? I promise ________ it on time.
A.return B.to return C.returning D.returned
I get used to ________ down the notes, so I can find some important points after class.
A.to write B.writing C.write D.writes
Although the movie is a little long, it's worth ________.
A.to watch B.watching C.watched D.watch
