－I____it as must of a student that he should say hello to his teachers first whenever they meet.－I can’t agree more.

Hundreds of Swedish workers are trialing a six—hour working day in the hopes that it will_____ sick leave and save the country money

. Research findings show we spend about two hours dreaming every night, no matter what we ____ have done during the day.

couldn’t _______.The line was busy.

He made another wonderful discovery, _______ of great importance to science.