—Do you know where David is? I couldn't find him anywhere.
—Well, he ______ have gone far—his coat's still here.
A. shouldn't B. mustn't C. can't D. wouldn't
She is getting better, but it will be some time ______ she is completely well.
A. that B. since C. when D. Before
The computer centre, ______ last year, is very popular among the students in this school.
A. open B. opening
C. having opened D. Opened
______ in thought, he almost ran into the car in front of him.
A. Losing B. Having lost
C. Lost D. To lose
—What did your parents think about your decision?
—They always let me do ______ I think I should.
A. when B. that C. how D. What
The thought ______ he might fail in the exam worried him.
A. when B. which C. what D. That
