1．In Iraq, some American soldiers died of ______(暴力) now and then.
2．Our English teacher ______(强调) the importance of learning English well.
3．The change in climate may ______(影响) your health.
4．Our natural ______(资源) are becoming more and more serious.
5．When the dog attacked me, I picked up a stick and ______(防卫) myself.
