气球以v=4m/s的速度竖直匀速上升，其下方悬挂一重物，在气球上升到离地某一高度时悬绳突然断开，则此时重物的速度是______m/s，若重物经7秒钟落地，则悬绳断开时重物离地高为______m．

改写句子 按括号中的要求完成改写后的句子，每个空格填一个单词。（5分）

小题1:I like salad for breakfast.(改为否定句)

I ___________ ___________ salad for breakfast.

小题2:The post office is across from the supermarket. (就划线部分提问)

_____________ _____________the post office?

小题3:The tourist asked me, “ How do you feel about Jinan Olympic Sports Center?” (改写句子，句意不变）

The tourist asked me how ___________ ___________ about Jinan Olympic Sports Center.

小题4:The girl has become a popular singer and many of her fans want to be like her. (改写句子，句意不变）

The girl has become a popular singer and she is ___________ ___________ to many of her fans.

小题5:People gave some food to the village girl when they saw her on the street last month. (改写句子，句意不变）

Some food ___________ given to the village girl when she was___________ on the street last month.