21. As a film star she was a success，but as a wife she was ________failure，so their marriage ended in ________failure.
A. 不填；不填 B. 不填；a C. a；a D. a；不填
22. Our teacher looked here and there on our playground as if________ for something.
A. looking B. to look C. looked D. to be looking
23. The speech which he made ________ the football match bored a lot of fans to death.
A. being concerned B. be concerned C. concerned D. concerning
