To tell ______ truth, he is at ______ loss what to do currently．

Do you know the man ________ is reading the book over there?——— Yes, he is Mr. Green, our P.E. teacher.

Mum, must I wash the dishes right now?—No, you ____.

If you don’t go to the party, ______I.

Have you got any books on English grammar? I want to borrow______.Yes, here you are. But you must return it by Friday.