--Where is Xiao Wang?--I don’t know. He__________ be in the library.
With the rapid development of medical science, we ______ more new drugs used in the treatment of cancer.
Although faced with stress from constant exams, she lost ______ of her enthusiasm for study.
All the citizens, young and old, walked and sang, beautifully ______ in new clothes of all kinds, _______ the success of their football team.
Market economy is a competitive economy, ______ I think, suppliers, producers and dealers should obey market rules and develop cooperative relation based on mutual benefits.
______ ever find something you want to save on your own computer, you can download it.