. Tracy has gone abroad for further study. It ____ be her. The girl you saw yesterday is her sister.
The picture ______ on the wall is painted by my grandfather.
Smoking pollutes air. You ______ smoke here.
Jane was dressed in red ______ Joe was dressed in blue.
---- Did you watch the football match yesterday? ---- Yes, I did. You know, my brother ______ in the match at that time.
---- Ann is in hospital. ---- Oh, really? I ______ know. I ______ go and visit her.