The little boy, out of curiosity, _______ the toy to see how it worked, but couldn’t put it together.
| A．took apart | B．broken down |
| C．burst into | D．knocked off |
I think going swimming in my spare time, _____ I think is great fun and good exercise as well as a useful skill.
| A．which | B．as | C．that | D．what |
Thanks to the Internet, large quantities of information are now _____ to us in our home.
| A．incredible | B．reasonable | C．valuable | D．accessible |
. Man must produce more grain to support the _____ growing population on earth.
| A．already | B．just | C．ever | D．yet |
The theory wasn’t accepted by many people when it was first ____, but it proved to be true as time went by.
| A．put forward | B．relied on | C．set out | D．given off |
He is good at maths and it won’t be long ____ he works out the problem.
| A．since | B．until | C．before | D．when |