1 . We have had to _______(适应) quickly to the new system. (根据汉语提示单词拼写)

2 . 对网络上瘾的青少年更容易患上精神疾病。
Teenagers ________ to the Internet are more likely to ________ ________ mental illnesses.

3 . I kept practising until I became confident enough to___________ (挑战) the good players. (根据汉语提示单词拼写)

4 . She holds his arm firmly to ______________(保持平衡). (根据汉语提示完成句子)

5 . Be careful not ________ (damage) the priceless vase. (所给词的适当形式填空)

6 . The City Council has a plan to ________ (beauty) the city. （所给词的适当形式填空）

7 . It’s the duty of the police to ________ the public order.
维护公共秩序是警察的职责。

8 . Good morning. I’d like to________ (登记，注册) for a class. I’m interested in any classes on music. (根据汉语提示单词拼写)

10 . I’d like to________(推荐) to you a package tour, which is popular among teenagers. （根据汉语提示单词拼写）