In east Africa,the people try not to see you when they meet you.They__(be)polite to you.
问题描述：
In east Africa,the people try not to see you when they meet you.They__(be)polite to you.
答
aren't是对的。楼上对！
答
are，用一般现在时，表一般情况
答
aren't
be polite to sb 对某人友好
答
are（复数）^_^