______you swim? — No, I can’t.

He had hardly reached home _______ an unexpected guest came to visit him.

It is raining hard. Will you go to your friend’s birthday party?—I promised him to go, but the heavy rain really places me in a ______. I’m not sure whether I will go or not.

I won’t take part in the party ________ Joe invites me. [ ]

To improve their oral English, everyone in the class is supposed to ______ actively in these discussions.