用方框所给单词的适当形式填空。

1. Be careful when you walk _________ the street.

2. They were _________ surprised at the wonderful magic tricks.

3. I hope I’ll be __________ enough to get a free ticket to the places of interest in Beijing.

4. We couldn’t help __________ when we watched the funny performance of Xiao Shenyang.

5. I have made a __________ to travel to Taiwan in the summer vacation.