Don’t go out on the thin ice, ________ you’ll fall in the river.
| A．and | B．but | C．so | D．or |
—Can you play the piano？
—Yes，I ________．I often practice it on weekends．
| A．needn’t |
| B．need |
| C．can’t |
| D．can |
There are ________ TV advertisements(广告) around us．
| A．too much |
| B．much too |
| C．too many |
| D．many too |
John，________ you have to wear sports shoes for gym class today？
| A．are |
| B．do |
| C．is |
| D．does |
—Will you stay here for supper？
—Sorry，I ________．I’ll have to meet my uncle at the station．
| A．mustn’t |
| B．can’t |
| C．needn’t |
| D．don’t |
—Please ________ to return my book by Friday．I’ll use it on Saturday．
—No problem．I’ll finish reading it on Thursday．
| A．don’t forget |
| B．not to forget |
| C．not forget |
| D．forget not to |