So necessary _____ it to learn about their customs that I will attend a special lecture next week.

It is well-known that the Internet will let people have ________ to huge amounts of information from their own homes.

It is well-known that the panda lives _____there isplenty of bamboo

Those experienced doctors in our country _______the meeting in order to find out the real_______ of bird flu(禽流感)

We’re glad to see the officials ______ for the fire accident in Shanghai punished.