The more one is ______ the English-speaking environment, the better he or she will learn the language.
When she woke up, she realized that the things she had dreamt about could not ____ have happened.
Our house is on the top of the hill, and in winter the winds __ be pretty cold.
--How long will you stay there? ---_____.
---I hear you’ve got a set of valuable Australian coins, __ I have a look? ---Yes, certainly.
You’ll have to spend ____ writing your report here.