The first few years in the 21st century ______ the rapid rise of China as a world economic power.

Please make sure that no details _____ before you deliver a speech.

— What do you want for breakfast, Mike?— I think I _______ some bread and milk.

Every possible means       to prevent the air pollution, but the sky is not still clear.

The wet weather will continue tomorrow when a cold front ______ to arrive.