______ we know, the air quality in the city has improved over the past two years.
Smoking is so harmful to personal health that it kills ________ people each year than automobile accidents.
I have made _______ clear _______ I have nothing to do with the accident.
On returning home, she found a note _______ to the door, _______ “Call in later.”
Although all of the apples ________, none of them ________ good.
Such good use had been his spare time_________ his English has improved a lot.