ⅰ.品句填词
a)根据句意及汉语提示，写出所缺单词。
1．when the train began to move quickly，helen excitedly ____________(挥手) at her friends on the platform.
答案：waved
2．my time is ____________(珍贵的)；i can only give you a few minutes.
答案：precious
3．when he came out of the water，he w
