周瑜惭愧地低下了头。

①疑问句：____

②否定句：____

③反问句：____

④双重否定句：____

神州8号飞船完成与天宫一号对接任务后返回。在距离地面1m时，返回舱的4台发动机开始向下喷气，由于物体间力的作用是____的，舱体受到向上的阻力增大，因此再次减速下降，在这个过程中返回舱的动能____重力势能____（填“增大”、“减小”或“不变”）

    Jim's grandparents live in a black building．____the building is a bus station．Jim always____off the bus there when he comes to see his grandparents．Between the station and the building is a busy street．____down the street three hundred metres and turn right，there is a big market．Jim's grandparents usually buy fruit，meat and____there.Now they are buying beef there.They like living there____it's easy for them to buy what they need and go out．

打球的时候，我们要遵守____规则。