How did you work out the difficult chemistryproblem— I worked it out by ________.

If you go to the meeting tomorrow, ________

Lots of trees ________in our city over the years. Itis becoming greener and greener!

What’s wrong You look pale.— Nothing serious. I’m just feeling ______ tired after the long walk.

When something _________ me, I can always go to my true friend Amy.