-_______is that boy ? -Oh , he is Ben .A、Whose B、Who C、What
——________ Mary happy today? ——I don’t think so. She ________ look happy this morning.
---I often go swimming in summer. ________________? ---I often stay at home.
----_______is your sister? ---She is thirteen years old.
Everyone ______ here now. Let’s ________.
---“Which class are you in ?” ---“ I’m in .”