根据语境补全句子中的单词。
（1）I like _______________（ 中国的）dancing.
（2）He_________________ （发明）this bicycle in 1839.
（3）He __________ （步行）to school yesterday.
（4）We  ______________（吃）a watermelon yesterday.         
（5）But he didn’t _____________（来）back.
（6）Lingling went to a shop and____________（买）a present.
（7）I  ________（帮助）my mum yesterday.
（8）This girl won a gold ____________ （奖杯）.
（9）Did you ______________（骑）your bike？
（10）What’s the __________________（麻烦事）?