— Susan, would you like to go hiking with us this afternoon?— I'd love to, but I study for a test.A. may B. have to C. can
Beijing is one of the ______ in the world today.
Eating some vegetables is good ______ your health.
Jim’s parents enjoy _____ in the countryside.
My shoes are cheaper than _____.
_____ he was tired, _____ he didn’t stop to have a rest.