Complete the sentences with the words below.

Write one word in each gap.

preserve, committed, concentrate, spiral, raise

A serial killer has [ ] many crimes in this strange small town.

Luca is coming to London for five months to help to [ ] money for the London Arts Centre.

Today's lecture at the university was about the **** [ ] cord.

If today's generations don't [ ] nature, the next generations won't see the green and blue planet in all its glory.

When you take the exam, try to [ ] only on the tasks.