Как называется эта тема? I have to gold a (speak) at my brother's wedding

I had no (difficult) in fimding the right street

He talked about (free) and peace in out world

(lucky), i was invited to watch the new film

The (destroy) of our rainforests is a serious problem

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Тема - Word formation.

1. I have to hold a speech at my brother’s wedding.

2. I had no difficulty in finding the right street .

3. He talked about freedom and peace in our world.

4. Luckily, I was invited to watch the new film.

5. The destruction of our rainforests is a serious problem.