Complete the sentences with the correct forms of the verbs in brackets.

Write one word in each gap.

[ ] by our optimism, Jane agreed to join our trip to Mexico. (to persuade)

[ ] under a thick layer of ground, the ancient golden figures survived through the ages. (to keep)

[ ] several years ago, the temple is of great interest for archaeologists and historians. (to find)

[ ] by high mountains, the valley is protected from winds and storms. (to surround)