You stepped into the lab with your shoes on? You’re _______ to take them off before you enter it.
| A．invited | B．supposed | C．forbidden | D．permitted |
Mr. Smith went to a bookstore, where a lot of books were .
| A．produced | B．invented | C．housed | D．disappeared |
Having concentrated for a long time he ____ his work, made some coffee and talked with his colleagues.
| A．put on | B．put aside | C．put off | D．put back |
----- Are you going to leave now ?
----- you would prefer me to stay here.
| A．When | B．Although | C． If | D．Unless |
--- I like football.
---______ my sister and me.
| A．So do | B．So are | C．So did | D．So it is with |
Choosing a college major can be a difficult task, but it is nothing to take .
| A．slightly | B．lightly | C．seriously | D．hardly |