All animals in nature must learn to to a changing environment in order to survive.
| A．attach | B．adapt | C．respond | D．turn |
—Hi, Tracy, you look tired.
—I'm tired. I __________ the living room all day.
| A．painted |
| B．had painted |
| C．have been painting |
| D．have painted |
Zhu Zhiwen __________ from a poor countryside finally had a chance to show his talent at the Spring Festival Gala.
| A．came | B．to come |
| C．coming | D．comes |
Some researchers are finding that daydreaming may be important to __________ mental health. Daydreaming, they say, is __________ good means of relaxation.
| A．the; / | B．/; the | C．/; / | D．/; a |
—What a bright room! Is it a classroom?
—No, it __________ the students' reading room.
| A．refers to | B．stands for |
| C．is supposed to be | D．is meant for |
It was a really terrifying experience. Afterwards everybody was very __________.
| A．shocking | B．terrifying |
| C．shocked | D．worried |