How kind you are ! You always do what you can ______ others .

 —Did Tom’s parents go to the meeting yesterday?—Yes,        of them did, but          spoke.

There is no ______. I have to write it on the blackboard with ______.

— Can I use your e-dictionary?  — Sorry. I don’t have ______.

The population of the world in 20 century became very much _____than that in 19 century.