Everyone has periods in their lives_______everything seems very hard.
Little Jim is going to spend his holiday in Paris, _____ lives his uncle.
The problem is not _____ easy. Think _____ over.
It is so difficult a problem that _____ student in this class _____ work it out.
Mr Zhang gave all the textbooks to all the pupils , except _____ who had already taken them .
Besides Tom , ______ Crosettes have two other sons , ______ of whom are all interested in making model planes .