—How about the book you are reading?
—Good indeed. It ________many problems we have come across in our study.
| A．says | B．talks | C．covers | D．refers |
It was announced that only when the fire was under control ___ to return to their homes.
| A．the residents would be permitted | B．had the residents been permitted |
| C．would be residents be permitted | D．the residents had been permitted |
______ you eat the correct foods ______ be able to keep fit and stay healthy.
| A．only if; will you | B．Only if; you will |
| C．Unless; will you | D．Unless; you will |
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 |