Things have changed quickly over the past decade and life in the country is much better than ___used to be．

 ---- Will you be on holiday soon? ---- Well, I’m too busy to take a holiday now. I’ll beable to take ______ later.

It is these poisonous products____ can cause the symptoms of the flu, such as headache and aching muscles.

Understanding the cultural habits of another nation，especially ________containing as many different cultures as America，is a difficult thing.

 He just does ______ he pleases and never thinks about anyone else.