Boys and girls, please don’t forget _______ your homework here this evening.
It is __________ difficult work __________ nobody can do it well.
––Did your mother go to Amy’s party?––No, she __________.
There will be an exhibition of the _____ of dictionary in our city next week. We can learn more about the dictionary’s history there.
"Double click" means you click twice on the button of the _______ to start the program.
一How long has Tom _______ Nancy? 一I don’t know. And I even didn’t know they ______ .