. When the teacher came in, the student pretended ________ his lessons.
–Does he know how to work out the problem ? -Yes , he has ________ a good idea to solve it .
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 .