Ⅰ.根据首字母或汉语提示，用本单元所学的单词完成下列句子（ 每个1分，共10分）
1. Helen was very d_______ that her parents weren’t injured in the earthquake.
2. Both parents and teachers consider the Internet to be an educational tool, thinking that it a_______ kids with the learning process.
3. Many important problems were s________ at the meeting and they would be discussed at the next meeting.
4. When the environmentally friendly cars came onto the market, many people were e_______ to buy them.
