It’s impossible for ____ few people to finish ____ a lot of work in only two days [ ]

Jack______ books in the library at 4 pm yesterday afternoon.

I can’t find my purse anywhere. — You ____ have lost it while shopping. [ ]

A new iphone costs about _________of a second-hand one．

I have been living in the United States for twenty years,but seldom _______ so lonely as now.