The first decade of the 21st century _____the breathtaking and non-stop development of China

For most informal dinners, you should wear comfortable and ______ clothes.

Excuse me, have you seen ________ lovely cat—Is it ________ black cat Just now I saw it sleeping under the table.

It is usually quite warm in my hometown in March, but it_______ be rather cold sometimes.

Now more and more workers ______their free time trying to improve themselves at school or college.