1．The doctor advised him to try to avoid foods which ________ (含有) a lot of fat．
答案：contain
2．We must let everyone know the ________ (重要性) of environment protection．
答案：importance
3．An unhappy home environment can ________ (影响) a child's behaviour．
答案：affect
4．China is getting more and more ________ (强大的) in the world．
答案：powerful
5．It will greatly ________ (威胁) the peace in the Middle East．
答案：threaten
6．The severe drought has e________ crops throughout the area．
答案：endangered
