It is thought that one billion people I the world, _ is half the word’s workers, earn their living by farming.
| A．if | B．that | C．which | D．what |
If anyone happens to drop in while I am out, ____ him or her leave a message.
| A．have | B．get | C．ask | D．tell |
—Would you like ____, sir?
—No, thanks. I have had much.
| A．some more oranges | B．any more oranges |
| C．some more orange | D．any more orange |
I made a call to my parents yesterday. To my disappointment, ____of them answered it.
| A．either | B．none |
| C．neither | D．nobody |
— What do you think of the White House?
— Splendid. While I was studying in America, I it twice.
| A．have visited | B．had visited |
| C．visited | D．would visit |
Everyone has periods in their lives everything seems very hard.
| A．which | B．where | C．that | D．when |