根据句意及汉语或首字母提示，填入恰当的单词。
The c______in this restaurant are very good.They can make lots of delicious food.
I can't________(许诺)，but I'll do my best.
March is the best time to p______ trees.
Look！There are many birds flying in the s_____.
Those  new_____(机器) kept  running for three hours.