It wasn’t until dark _________ he found _________ he thought was the correct way to solve the problem.
| A．when , that | B．that , that | C．when , what | D．that , what |
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 |
--- What shall we prepare for our picnic this weekend?
--- Well, let’s discuss it ______ lunch.
| A．at | B．with | C．over | D．by |