on his past mistakes, Ted realized that he hadstayed around the wrong people.

Have you seen Jack His mother is looking for him all the afternoon.–No, I haven’t. I am sure his mother________be very worried.

34 I am _____ sure that I have told you that before

Air pollution has become ____than ever before. We must do something to stop it.

The idea ____ he didn’t have to stop at the red light at night caused the traffic accident.