. Doing your homework is a sure way to improve your test scores, and this is especially true ______ it comes to classroom tests.
| A．when | B．since | C．before | D．after |
31．Every solid object______reflect a sound，varying according to the size and nature of the object．
| A．must | B．shall | C．will | D．Should |
30．Are you certain that this is _________in his speech?
| A．as Premier Wen stressed | B．how Premier Wen stressed |
| C．that Premier Wen has stressed | D．what Premier Wen has stressed |
29．— How do you Chinese celebrate Mid-Autumn Day?
— Well，it depends．For me，I usually sit in the yard，________the full moon with my family．
| A．appreciating | B．admiring | C．appreciated | D．to admire |
28．Although the false banknotes fooled many people，they did not____close examination．
| A．put up with | B．fit in with | C．stand up to | D．1ook up to |
27．These natural parks aye very important for preserving animals，which would_______-run the
risk of extinction．
| A．otherwise | B．therefore | C．besides | D．However |