I am trying my best to learn English, but it doesn’t work well! —Don’t worry! Regard it _____ a big challenge! [ ]

The purpose of the campaign is to raise the public’s_______ of the dangers of passive smoking.

Do you know ______ this i-pad belongs to? – Let me see. Oh, it’s ______.

of shoes do you wear?—Size 8.

I can’t thank you ____ much because without your help I ____have won the first prize.