After the Yushu earthquake, to make sure that rescue work could be carried out as smoothly as possible, Premier Wen Jiabao________ his visit to Brunei.

At times the balance in nature is ______ , resulting in a number of possibly unforeseen effects. 

Every time Gina catches her employees _____ time, she reminds them that time is money.

The moment we heard the news of the earthquake, we began to ________ the work to rescue those who were trapped in the building.

This new firm will ________the crowds, whatever its quality, as long as it gets advertised in the right way.