180. There is a _____ of understanding between them. Otherwise, they will be good friends.
| A．sufficiency | B．abundance | C．adequacy | D．Lack |
----Why are your hands so dirty?
----I ____________in the garden.
| A．was working | B．have worked | C．worked | D．have been working |
---Why not open the windows to let _____cool air in?
---I’d rather you didn’t. ________air in out town is terribly polluted.
| A．a; The | B．/; The | C．/ ;/ | D．the; / |
----Are my clothes too casual?
----No. You can go ____you are.
| A．as | B．what | C．that | D．where |
How ___I help them to understand when they won’t listen to me?
| A．can | B．would | C．may | D．must |
In summer, food will go bad if________in room temperature.
| A．leaving | B．left | C．being left | D．having left |