根据所给单词的汉语意思，用单词的适当形式填空。
I suggest you spend less time               （聊天）.
We must take            （措施） to prevent environmental pollution from getting worse.
Her father advised her to keep her              （距离） from that fellow.
         （传统的）teaching methods sometimes fail to keep students concentrated.
I’ve got to apologize for my                （行为）. I was out of line.
Children eat ice cream in the            （阴凉）.
And any       （争论） between us would not cause me to lose heart or feel a sense of loss.
The author             （提及）to his teacher twice in his article.
This book is          (计划) for beginners.
The professor will             （发表；递送）a speech at the meeting.