The ____ you start, the _____ you will be back.

 _______ to settle into the new environment, he made every possible effort.

It seems quite _____ to expect a student to master 3,000 words within only 5 days.

25．If you sleep short of 7 hours, you are three times _______ to catch a cold．

At the end of the year 2010, some species of birds ddn’t survive the _____ winter in some European countries.