People in many parts of the world are ______ for water, and more people will need morewater in the next century.[ ]

It is too cold today. I think I’ll have a hot coffee ______ a cold drink.

Some researchers believe that there is no doubt ____ acure for AIDS will be found.

_____ do you go to the zoo with your brother—Three times a month.

Let’s send him home. Do you know _________– I have no idea.