Many a student ______ made that mistake before, which is another way of saying a great many students ________ made that mistake.
| A．had; has | B．has been; have | C．have; has | D．has; have |
________energy, we turn off the lights for Earth Hour on the last Saturday in March
| A．Saving | B．To save | C．Saved | D．Having saved |
American students take part in a wide variety of after-school activities _______ they develop their social skills.
| A．where | B．which | C．that | D．what |
Jenny is quite good at taking notes. She can _______ almost every word her teachers say in class.
| A．set about | B．set aside | C．set down | D．set out |
---Have you read any novels written by the famous writer Mo Yan?
--- Yes, of course. I ______ several of his works when I was studying abroad.
| A．read | B．had read | C．have read | D．was reading |
Thanks to scientific research, we now have a good understanding of ______ an earthquake is and why it happens.
| A．how | B．which | C．whether | D．what |