——There must be a dozen pens in this house but I can never find one when I need one.——Keep looking. ______is sure to turn up.
We had ____ fun at Mary’s birthday party last Sunday.
On hearing his son’s survival, the worried mother _______
He behaves _______ he were better than us.
The question of drug-taking is bound to(一定要) ______ at the next conference.
_______ and you will make rapid progress.