Lily can swim. What ________ you do? ----- I can skate. A. can B. do C. are
—What’s the matter________your computer?—It doesn’t work.
The problem is________difficult that nobody can work it out.
—Smoking is bad for your health.—You’re right.I decide to________.
—How did he use to go to school?—By bike.But now he’s used to________to school.
Do you know the man________is talking with the teacher?