---What made her unhappy?
---_____.
| A．Because she lost her wallet | B．she lost her wallet |
| C．Losing her wallet | D．To lose her wallet |
.Mr. Brown has a strange way of writing. This is a notice from him, but no clear ______ of what he has written can be made at all.
| A．explanation | B．sense |
| C．meaning | D．idea |
Someone who lacks staying power and perseverance is unlikely to ______ a good researcher.
| A．make | B．turn |
| C．get | D．grow |
.-- His father is a professor and has been teaching in the university for more than twenty years.
-- _____.
| A．So is his mother | B．So has his mother |
| C．So his mother does | D．So it is with his mother |
.Why? I have nothing to confess. _______ you want me to say?
| A．What is it that | B．What it is that |
| C．How is it that | D．How it is that |
.Don't have your children _____ for hours reading books in _____ dark a room.
| A．sitting; so | B．sit; such |
| C．to be sitting; so | D．to sit; such |