—Is Mary sure _______ the exam?
—I think so. She is good at math. I’m sure ______ she can pass it.
| A．of passing to | B．of pass, that |
| C．to pass, that | D．to pass, of |
—Were you at Mary’s party last night?
—No, I ____________ my sister. She met with difficult problems.
| A．help | B．am helping |
| C．have helped | D．was helping |
My grandparents____ in that city since 2008.
| A．will live | B．live |
| C．have lived | D．were living |
一Oh，there’s someone knocking at the door．
一 must be that naughty boy.
| A．He | B．This | C．It | D．That |
We can’t do it that way --- but whether it will work is ______ matter.
| A．other | B．another | C．each | D．every |
--- ______will the invitations be sent to our guests? --- In three days.
| A．How often | B．How soon |
| C．How long | D．How far |