Only after he realized the significance of mastering two languages ______ English carefully.
| A．did he set about learning | B．did he set out learning |
| C．had he set about learning | D．had he set out learning |
-Can you help me with the maths homework, mom?
-You can't always ________others' help for your homework.Do it by yourself this time, dear.
| A．wait on | B．rely on | C．insist on | D．turn on |
I________through that bitter period without your generous help.
| A．couldn't have gone | B．didn't go |
| C．wouldn't go | D．hadn't gone |
These old pictures bring to their mind the college days ________ they spent together, ________ life was hard but happy.
| A．when; whose | B．which; whose |
| C．which; when | D．when; which |
_____ leaves the room last ought to turn off the lights.
| A．Anyone | B．The person | C．Whoever | D．Who |
You can’t imagine ______ when they received these nice Christmas presents.
| A．how they were excited | B．how excited they were |
| C．how excited were they | D．they were how excited |