－Any information about your son?
－No，if only I ______ those tough words to him．
| A．didn’t say | B．hadn’t said |
| C．shouldn’t have said | D．couldn’t have said |
Only when you leave school________how much you love it.
| A．you will find | B．will you find |
| C．you find | D．did you find |
So mysteriously ______ missing that many puzzles wait to be solved.
| A．did Flight MH370 go |
| B．Flight MH370 went |
| C．does Flight MH370 go |
| D．had Flight MH370 gone |
For a moment nothing happened, and then ______ all shouting together.
| A．voices had come | B．came voices |
| C．voices would come | D．did voices come |
---I have finished my homework.
---___________.Let’s go to play tennis.
| A．So have I | B．I have so |
| C．So did I | D．So you do |
— Did you know any French before you arrived in Washington?
— Never ______ it, actually.
| A．had I learned | B．have I learned |
| C．I learned | D．was I learning |