Ten years ago the population of our village was _______ that of theirs

I think English is ____unimportant subject.—I don’t think so. It is ____useful tool when we talk with foreigners.

The road is covered with snow.I Can’t understand _______ they insist on going by motorbike.

Tom hardly had time for concerts at that time, ____

decided to concentrate all my efforts _____ the complicated problem.