If nothing ________， the oceans will turn into fish deserts.

Nowadays, many people walk to work ____Copenhagen Conference calling for living a low-carbon lifestyle to cope with global warming

The school took the students ’ request into consideration that a party______ be held to celebrate the victory.

I’ve worked with children before I know what _____in my new job. [ ]

Finally they arrived at a place ________sold cigarettes and other small articles.