With so much work _______to be done，the physician looked very worried.

I’m afraid Mr. Harding_________see you now.He’s busy.

m, You look tired–Yes, I _____________ the room all the afternoon

Is it necessary that he ____ to London but to New York?– I think so, but the problem is ____ he has refused to.

The traffic is moving very slowly as so many carson their way back to Shanghai.