-- Someone is knocking at the door. Is it Amy?--It ________ be her. She is giving a performance at the theater now.
Liu Xiang gave up(放弃) the match______ his illness.
. I saw him in the library yesterday. He________ a book at that moment.
—Oh ____ good boy!
There is ____ with my computer . It doesn’t work .
— What’s ______ wrong? — I have ______ stomachache.