The population of the world in 20th century became very much _________than that in 19th.
A. bigger B. larger C. greater D. more
If you have lost a library book, you have to _________ it.
A. find out B. look after C. pay for D. take care
If anyone wants to say something in class, you ________ put up your hands first.
A. must B. may C. should D. Can
-- __________ you ________ your book to the library?
-- Yes. I returned it yesterday.
A. Did, return B. Have, returned
C. Will, return D. Do, return
The missing boys were last seen ______ near the river.
A. to play B. play C. to be playing D. playing
I’m going to look for another job ________ the company offers me more money.
A. after B. unless C. When D. for
