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 was ____________(颤抖) with cold.
答案：trembling
4．She got into a ____________(惊慌) when she found she had lost her necklace.
答案：panic
5．Interest is the best teacher，and a lack of interest is a ____________(保证) of failure.
答案：guarantee
B)在句中空白处填入适当的内容或括号内单词的正确形式(不多于3个单词)。
6．Hiking trips can be ____________(comfort) and even dangerous.
答案：comfortable
7．There is growing public ____________ (anxious) over levels of air pollution in our city.
