One hundred thousand years ago, ________ choice was simple when it came to ________ drink—there was no choice. It was water or nothing.
| A．the；a | B．a；不填 |
| C．the；不填 | D．a；the |
The girl arranged to have piano lessons at the training centre with her sister______ she would stay for an hour.
| A．where |
| B．who |
| C．which |
| D．what |
Children who are not active or_____ diet is high in fat will gain weight quickly.
| A．what |
| B．whose |
| C．which |
| D．that |
After graduating from college, I took some time off to go traveling, ____ turned out to be a wise decision.
A. that
B which
C. when
D．where
Ellen was painter of birds and of nature,_______ ,for some reason, had withdraw from all human society.
| A．which |
| B．who |
| C．where |
| D．whom |
We live in an age______ more Information available with greater ease than ever before.
A．why
B．when
C．to whom
D on which