He has some trouble ______ his classmates, but he has no trouble ______ doing his lessons.

____ is no wonder that the building is ____ now; it was so big a fire last night.

.She was, ______ thousands of others, interested in this kind of work.

 I think teachers should be strict _______ their students ______ studies.

It turned out that she won the first prize in the competition, which was      her modest expectation.