----Goldfish don’t know __________ to them three seconds ago.
----Really? It’s so amazing!
| A．what is happening | B．what to happen |
| C．what will happen | D．what happened |
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 |
I saw him in the library yesterday．He________a book at that moment．
| A．reads |
| B．is reading |
| C．was reading |
| D．will read |