_______ your letter, I am pleased to tell you that you are to receive the answer by the end of this week.
The road constant improvements can't keep pace with the increasing ____ .
We should take good care of our ____. Don't forget to rinse your mouth after meals.
Records, ____, walkman CD and MD are the same instruments that we can use to enjoy music.
The limited supply of water has been put into practice, take care to turn off the running ____ before you leave.
The bank is equipped with new alarm _____. We can say it's safe and reliable completely.