—Excuse me. Could you wake me up when my friend ______here?—Of course. But we still don’t know when your friend ____ here.
Yunnan is beautiful and I’m ______ visiting it again.
I ______ ride a bike to school. But this morning, I walked to school.
Let’s open the windows to have some ______ air here.
--- When ______ you ______ here? --- Two days ago.
--- Will you carry the box for me, please? --- Sure, ______.