21.Here’s one of the best ways to protect your skin—_____ too much sunshine.
| A．not to absorb | B．not having absorbed |
| C．having not absorbed | D．don’t absorb |
—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 |