---How far is it from your school to Lake Taihu?
---It’s about ________ drive.
| A．forty minute | B．forty minutes | C．forty minutes’ | D．forty-minutes |
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 |