7. If b__________ in, they can result in illness or even death.(吸入)

6. There people live in perfect h__________ with nature and the outside world is forgotten.(和谐)

5. Nature has p__________ Shangri-la with endless treasures.(提供)

4. Don’t seem to be too c__________ about everything when you go to a new place.(好奇)

3. This is an accident d_____ to careless driving.(因为)

2.He spent all his life doing the r___________ on the crops.(研究)

1. The police went out in s__________ of the missing boy.(寻找)