It is hard for us to eat better, exercise more, and sleep enough, ________ we know we should.
| A．since | B．even if |
| C．unless | D．as if |
_____ the government recovers the vehicle purchase tax and the oil prices go up continuously, the sales of the vehicle in China are still increasing every year.
| A．When | B．Once | C．Since | D．While |
After the flooding, people were suffering in that area, _____ urgently needed clean water, medicine and shelter to survive.
| A．who | B．where | C．which | D．that |
-- Why didn’t you go to Mike’s birthday party yesterday?
-- Well, I _____, but I forgot it.
| A．should | B．would | C．should have | D．must have |
It is not how much we do but how much love we put into what we do _____ benefits our work most.
| A．when | B．that | C．what | D．how |
Evidence has been found through years of study _____ children’s early sleeping problems are likely to continue when they grow up.
| A．why | B．how | C．that | D．whether |