Now air in our town is ____ than it used to be. Something must be done to it.

Would you like some meat —______. I’m full (饱的). I don’t C

l be a big help if you go to the store and get what we need for dinner. ______, I’ll set the table.

________ the case, I couldn’t help but _________him.

The man ______ gave us a talk on science yesterday isa famous scientist.