词形变换，根据所提供的句子意思，将所给单词的正确形式填空，使句子意思完整。
That's an ________(interest)computer game．
根据下列句子及所给汉语注释，写出空缺处各单词的正确形式，每空只写一词。
We had a ________(野餐)in the park last weekend．
He tried to stop smoking, and he ________(成功)．
Lucy is too busy, let me go ________(代替)．
Music can make you ________(放松)after homework．
How much did you ________(花费)for the nice coat?
根据句意和提示写出单词，完成句子。
Like many famous scientists, Li Siguang devoted himself to ________(study)science．
About three ________(five)of the doctors in the hospital are women．
There is a truck ________(collect)litter outside now, then it will carry all the litter out of the city．
They want to be singers, so they always do what they can ________(practice)dancing．