—It is _______he often fails in exams_______ makes his parents worried about him.—So, he has to work whole-heartedly.
_____he come, the problem would be settled.
Without your help, I ____the exam last term.
The young man insisted that he_____nothing wrong and___free.
You must be a student, ________you?
We all agreed to her suggestion that we______to the Great Wall for sightseeing(观光 ).