____ the Internet is of great help, I don’t think it’sa good idea to spend too much time on it.

He got up quickly as soon as the alarm clock _______.

When the H1N1 virus____ at first in Mexico, no one had the least idea that it would spread so rapidly throughout the world.

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

There are a small number of people involved，possibly ________ twenty