—Must I turn off the gas after cooking?
—Of course, you can never be ____careful with that．
| A．enough | B．very | C．so | D．Too |
—These grapes look really beautiful．
—They _______! See the price $3．99 a pound．Very expensive, aren’t they!
| A．might | B．could | C．would | D．should |
It is typical of students to stay up ________ deep into the night for the final exam．
| A．to read | B．having read |
| C．to have read | D．reading |
Lenovo has brought out a new laptop ________ low cost will make it attractive to students．
| A．which | B．where | C．whose | D．what |
Tourism, _______ it brings in money to a country, can also result in damage to the World Heritage sites there．
| A．once | B．while | C．if | D．as |
“Judging the voice, and not the appearance” makes the show—The Voice of China ________from the numerous other reality shows in China．
| A．knock off | B．stand out |
| C．come across | D．get through |