There’s ______ here and there. Let’s sweep it away. 

I have two sisters, but ____ of them is a teacher.

— Why do you always go to Zhejiang University on weekends?— Because there’re lots of great speakers I can practice English            in the English Corner there.

. – ______Bob be the manager of our company? – He ______ be, but I’m not sure.

You have to be ______ and wait until I finish my work.