I find ________ difficult to remember everything, though I’m still young.

China is larger than _________ in Africa. 

— My father has just bought          a new computer.— Really? How lucky are!

----Are Mr. and Mrs. Wang living alone in the house? ----Yes, altough they have three sons,      of them live with their parents.

.---____ did you leave the classroom? ---____ I saw my daughter sit down and read her book.