第1题：
lead to its eventual solution
provide an effective way to slow it down
help to prevent it from worsening
warn people whose homes are in danger
第2题：
第3题：
How to increase one’s speed in a bicycle race.
Major Canadian bicycle races.
The contribution of cycling to health.
An annual cycling event.
第4题：
第5题：
第6题：
第7题：
第8题：
第9题：
She felt embarrassed when giving a presentation in class.
Her presentation received a poor grade.
She had not completed her assignment.
She was unable to attend her psychology class.
第10题：