_______you worked late yesterday, you need ’t have come this morning.
| A．Unless | B．Though | C．Once | D．As |
He waited until it was dark ____ nobody could see him clearly.
| A．so that | B．in order to | C．although | D．however |
Now there are many _____ in our company.
| A．woman doctor | B．women doctor |
| C．woman doctors | D．women doctors |
We should think of ways to stop the waste from the factory _____ our living environment.
| A．being polluted | B．polluting | C．from being polluted | D．polluted |
In my opinion, all Mr. White ___ good to his students in his class at present. He is very strict in their study.
| A．does does does | B．does do do |
| C．does does do | D．did do does |
___ nice, the food was sold out soon.
| A．Tasted | B．Tasting | C．To taste | D．Being tasted |