1.It's too hot inside.Let's keep the windows___(open).
2.You need to keep your eyes_______(close)when doing eye exercises.
3.Boys and girls,please keep our classroom ______(clean).
4.I'm sorry to keep you ______(work) so late.
答案1.open 2.closed 3.clean 4.working
keep sb/sth + 形容词 使某人某物处于某种状态 或keep sb/sth doing sth 让某人一直做某事