1He __ __ __ /应该/stay at home2.When did the accident __ __ /发生/3Please __ __ __ /问好/to you
问题描述：
1He __ __ __ /应该/stay at home2.When did the accident __ __ /发生/3Please __ __ __ /问好/to you
答
1.should 或者 ought to
2.happen 或者take place
3.say hello