People working 10 or 11 hours a day are more likely to suffer from heartproblems than_____ who go off duty after seven hours

There isn’t ______ in the classroom. Let’s turn off the lights.

ndergartener sat them down to read andpaint,________ all the children wanted to do was to make a mess

Who’s that—My sister. works in a factory.

Mary has recently got engaged ________ aforeign teacher, who has been engaged ________ education research for years.