_______ she was your friend, I would have invited her to the party.
| A．If I know | B．Were I to know | C．If I knew | D．Had I known |
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 |
Our teacher is always busy preparing lessons
until 11 o’clock at night, _______we students have gone to sleep.
| A．that time | B．by which time | C．by that time | D．which time |
The news ____is spreading around the airport is_____a heavy storm is coming.
| A．what; / | B．that; that | C．/; that | D．that; which |
He is taller than he ________.
| A．used | B．used to be | C．used to | D．used to do |
If you stand here, you’ll get a better________of the river.
| A．sight | B．view | C．scene | D．scenery |