---who______it be that is knocking at the door?
---It_______be Father, but I’m not sure.
| A．can, must | B．can, may | C．must, can | D．may, must |
I have been living in the United States for twenty years ,but seldom _____ so lonely as now.
| A．have I felt | B．I had felt | C．I have felt | D．had I felt |
_______ that Marie was able to set up new branches elsewhere.
| A．So successful her business was | B．So successful was her business |
| C．So her business was successful | D．So was her successful business |
Little ____that we were watching his every move, so he seemed to be going his own way in this business.
| A．he realized | B．he didn’t realize | C．didn’t realize | D．did he realize |
----My room gets very cold at night.
---____________.
| A．So is mine | B．So mine is | C．So does mine | D．So mine does |
---How was the televised debate last night?
------Super! Rarely _____ so much media attention.
| A．a debate attracted | B．did a debate attracted |
| C．a debate attracted | D．attracted a debate |