circumstances ________ our control, theperformance has to be canceled

Helen, ________ her mother, ________ dancing verymuch.

ing to statistics, Chinese people between the ages of 18 and 70 read 6.7 books___ last year, including paper books and e-books.

Nowadays people are convinced ___ the negative effect of second-hand smoking ___ people around.

My mother and her old friends talked of some things and people ________ they remembered in the school.