Choose the correct word in these sentences.

1. I have always tried not to ____________ ______ in things that are not my business.
A) intervene
B) interfere

2. ____________ ______ at the factory is not good. There have been several accidents involving machinery recently.
A) Security
B) Safety

3. There are some ____________ ______ I don’t like to talk about with my friends, such as politics and religion.
A) themes
B) topics

4. He was dozing happily in the ____________ ______ of an old beech tree.
A) shade
B) shadows

5. The ____________ ______ of her latest novel is growing up as an only child in the 1970s.
A) theme
B) topic

6. The teacher ____________ ______ to stop the argument between the two students.
A) intervened
B) interfered

7. The receptionist called the ____________ ______ officer once it became clear that there had been a burglary.
A) safety
B) security

8. He was ____________ ______ complaining about something or other.
A) continually
B) continuously

9. The moon sometimes casts wonderful ____________ ______ on the sea.
A) shadows
B) shade

10. You have to press the button ____________ ______ until the green light comes on. Don’t take your finger off it, or it won’t work.
A) continually
B) continuously