Lisa spent all________day cleaning her room．
| A．a |
| B．an |
| C．the |
| D．／ |
With the development of science, our country is becoming_________
| A．strongest and strongest | B．stronger and stronger |
| C．strong and strong | D．more strong and strong |
My little sister_________ in the hall at that time yesterday.
| A．dance | B．dances |
| C．is dancing | D．was dancing |
You can’t understand the meaning ________you read the text.
| A．unless | B．if |
| C．because | D．whether |
Danny,______ more careful or you will fall down.
| A．to be | B．being |
| C．to being | D．be |
____interesting experiment it is!
| A．What | B．What an |
| C．How | D．How an |