. ----Peter, where did you guys go for the summer vacation?----We________ busy with our work for months, so we went to the beach to relax ourselves.
Of all the books on the desk, __________ is of any use for our study.
I used to earn __________ than a pound a week when I first started work.
I hear __________ boys in your school like playing football in their spare time, though others prefer basketball.
My most famous relative of all, __________ who really left his mark on America, was Rob Sussel, my great-grandfather.
Human facial expressions differ from those of animals in the degree __________ they can be controlled on purpose.