A vast area north of the Yangtze River ______by the first heavy snow of the new year，causing difficulties to the post-festival road transport.
| A．were affected | B．was affected |
| C．had affected | D．has affected |
34．More and more people shop online,________advantage of low prices.
| A．having taken | B．taking | C．taken | D．having been taken |
33．The Day of the Dead, an ancient Mexican festival, is not a sad day, but _________time to celebrate__________cycle of life.
| A．a, the | B．不填, the | C．不填,a | D．the, a |
32．How_________I help them to understand when they won’t listen to me?
| A．can | B．would | C．may | D．Must |
31．In summer, food will go bad if_________in room temperature.
| A．leaving | B．left | C．being left | D．having left |
30．QQ,______you can chat with your friends, makes communication easy.
| A．why | B．which | C．that | D．Where |