Chinesepeople were so excited when they saw president Hu ____the PLA on the NationalDay of 2009

stars from the entertainment industry, such as Ke Zhendong and Fang zuming, have recently been arrested, which shows that drug taking is becoming _____ increasingly serious threat to society.

Before a problem can be solved, it must be obvious ________the problem itself is.(2011·湖南)

The girl is ______ in the film.

Mr. Yang, will we have a PE class today–Tell the children if it __________, come down to the playground.