To her ________，the salesgirl still helps that old lady.

The little boy came riding full speed down the motorway on his bicycle. ______ it was!

Cloning an animal is a complex ________ that can go fatally wrong at any stage.

As a heavy smoker , he finds it hard to get rid of the habit, which has a bad _____on his health.

.---How long did Mary work here?---For half a year, but she didn’t leave us much ____. We hardly remember what she is like.