______ do you like science? --- Because it is fun.
A. Why B. When C. What
They went to the church________silence．
| A．for |
| B．on |
| C．in |
| D．with |
My parents________for me to have dinner when I got back home yesterday evening．
| A．wait |
| B．waited |
| C．have waited |
| D．were waiting |
Most people are________building a paper factory near here．They are worried the river will get polluted．
| A．for |
| B．with |
| C．against |
| D．beyond |
Yesterday evening I was playing the piano________the doorbell rang．
A．when
B．before
C．while
Tony________TV when his mother came in．
| A．watch |
| B．watches |
| C．was watching |
| D．is watching |