--Still remember the first time we met in the railway station?--Of course. You ________ for the train to Shanghai.

— Why is the librarian looking so hard at me?— You ____ to read aloud in the reading room 

The little boy is dirty from head to foot because he______in the mud all morning.

It was for the first time that the two countries ______ an agreement.

In addition to what ________ above, his speech was also involved in some big issues of our society.