问题:

根据句意和汉语注释,在答题卡标有题号的横线上,写出单词的正确形式。 1. Sometimes ____________(深厚的) feelings are hard to put into words.
2. Mr Wang was busy, but he ____________ (坚持) on seeing me off at the airport.
3. Will you join us in the  ____________(讨论)about the teenage problems.
4. You can cross the road in ____________(安全)when the traffic lights turn green.
5. In the morning taking a walk and ____________(呼吸)some fresh air are good for your health.

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