This printer is of good quality. If it ________ break down within the first year, we would repair it at our expense.
High school students should be given enough sleeping time , _______ they are busy with their study .
She told us ______ story that we all forget about the time .
She told me _______ a noise in the hall .
_______ of 2006 , there were about 6000 foreign printing companies in China .
He commanded that the work _______ before 5pm .