Here’s a rewritten version of the text:

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**Test 2:**

**Rewrite:**

1) We were unable to answer those two difficult questions.
Those two questions were too difficult to answer.

2) Mark is not old enough to watch that horror film.
Mark is too young to see that horror film.

3) People in many countries are currently watching this football match on TV.
This football match is being watched on TV by many people.

4) We were unable to drive due to the fog.
The fog prevented us from driving.

5) I stopped and bought a newspaper.
I stopped to buy a newspaper.

6) We watched them leave, and I will never forget it.
I will never forget watching them leave.

7) How long has it been since they moved here?
When did they move here?

8) Knowing English is beneficial.
It is useful to know English.

9) It took us two hours to water the flowers.
We spent two hours watering the flowers.

10) He is very wealthy, yet he is not happy.
In spite of being extremely rich, he is not happy.

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Let me know if you need any changes!