Everything from greeting to eating can be an opportunity to do the wrong thing which not only embarrasses yourself, but ____ your host. [ ]

The on your face told me that you were happy to help us.

I support your decision, but I should makeit clear that I am not going to be _____ to carry it out.

There’s a hole（洞）______ the wall and a picture ______ the wall.

Has your mother finished her paper yet? — I don’t know; she _______ it this morning.