26. We gave out a cheer when the red roof of the cottage came ________ view.

A) from B) in C) before D) into

27. They took ________ measures to prevent poisonous gases from escaping.

A) fruitful B) beneficial C) valid D) effective

28. Doing your homework is a sure way to improve your test scores， and this is especially true ________ it comes to classroom tests.

A) when B) since C) before D) after

29. Careful surveys have indicated that as many as 50 percent of patients do not take drugs ________ directed.

A) like B) so C) which D) as

30. In developing countries people are ________ into overcrowded cities in great numbers.

A) breaking B) filling C) pouring D) hurrying

26-30 DDADC