Computers must be of great use to ________ doing the scientific research. 

 He who is proud of his wealth has rarely _____else to be proud of.

Don’t you consider _____ important to learn English well?

With children, if you say "no", you have to mean ______.

——There must be a dozen pens in this house but I can never find one when I need one.——Keep looking. ______is sure to turn up.