You'll find it hard to get rid of the drug habit you have it.
——What’ s the matter? —— The shoes don’ t fit properly.They____my feet.
.In this experiment, they are woken up several times during the night, and asked to report what they____.
When he was alive, the old scientist used to say that knowledge ____from practice and he gained his experience by doing a lot of practical work.
He ___articles for our wall-newspaper these three years, and he ___about forty articles.
The children ______ very quiet; I wonder what they ____up to.