What’s the matter You looked unhappy.—Well, the teacher spoke so quickly and I can__________ understand it.

Tom’s score on the test is the highest in the class. He _____.

The telephone rang, but it________before I could answer it. [ ]

uncertain side effect the medicine will bring about, although about two thousand patients have taken it

Did the door-keeper let you in? — No__________ I tried to tell him that I was your cousin, he just didn’t believe me