—What does PM2.5 mean?
—It's a professional ________ indicating the condition of air pollution.
| A．term | B．item |
| C．number | D．mark |
I feel it is your husband who ____ for the spoiled child.
| A．is to blame | B．is going to blame |
| C．is to be blamed | D．should blame |
At the back of the garden ____,which gives us much shade
| A．a tall tree standing | B．does a tall tree stand |
| C．stands a tall tree | D．standing a tall tree |
Ladies and gentlemen,please remain_____until the plane has come to a complete stop.
| A．seated | B．seating | C．to seated | D．seat |
—Lily can’t afford a holiday and this upsets her very much.
—, let’s give her a hand.
| A．If ever | B．If any | C．If only | D．If so |
in the novel that he did not notice his father at the door.
| A．So he was absorbed | B．So was he absorbed |
| C．So absorbed he was | D．So absorbed was he |