Not only the twins but also their cousin Jim _______ been to Japan, but _______ of them can speak Japanese.
I can’t go to your party, because I have __________ homework to do today.
Mike’s mom is ill. He is ___________ her at home.
It’s unhealthy to sleep with all the windows ___________.
__________ the room until you finish all your work.
Li Ping __________ swim when he was only 5.