The machine is designed to _______ people recycle wastes to a great degree but the result still remains to be seen.

New ways have to be found to _______of waste materials and poisonous gases so that we can have cleaner surroundings

Reviewing the video monitor afterwards, they noticed two armed men with their faces covered by masks step out of a carriage and ______the bank through the backdoor.

No sooner had I began to sing the English song than it was_______ by a 13-year-old girl. She sang the song so beautifully that I couldn’t help asking her when she had ______ the study of English.

They are representatives of farm workers and the frustrating conditions they are in are______ the true state of the majority of them.

 When you are _______ about which button to press on the complicated machine, you can either read the user’s guide for guidance or fax us for specific instruction. Don’t ______ the trial-and-error method.

The local government has again _______ its words not to swallow the arable land for town building and the farmers can do nothing but swallow it. Which of the following is NOT OK?

The most important _____ of the job as a typist is to be able to type fast and _______.

It is every citizen’s duty to go out to ______ the snow on the street______ it stops falling so as to make it convenient for traffic to pass. . 

The goods on this counter ____ at a discount of 25%, like the typewriters, television receivers, dustbins, etc.