I didn't see your sister at the party. If she __, she would have met my brother.
| A．has come | B．had come | C．did come | D．came |
Susan started to clean the room; __________Lily was preparing lunch.
| A．however | B．but | C．meanwhile | D．when |
----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 |