What do you think of _____ show in Ocean Park—I should say it was _____ great success.

We all know that learning a foreign language time and effort.

In the dark forests＿＿＿，some of which are large enough to hold several small towns.

One of the greatest benefits of stamp－collecting is that they are based on common interests，________ appearance，age orwealth.

The two old friends were ____ busy ____ with each other that they forgot the time.—Yes. They hadn’t met for over ten years, so they kept talking the whole night.