9. combines 10. struggled/fought　 11. fear/fright　　 12.prize 13 owed　 14 afford

50.　 The students o________ the rules and agree not to use their phones in the classroom.

The answers:

1 crashes 2. survive 3. share 4.alone 5. communicate　 6.experience7.safety 8.protect

49.　 When I was passing the National Hall，I heard the clock s_______________ twelve.

48.　 Finally the police s__________________ the thief and put him into prison.

47.　 We had no m_______________ of transport except for two bicycles.

46.　 My friend is h______________. He never tells lies.

45.　 He is c_________________ how to solve the problem.

44.　 Meryl Streep got m______________ in 1978 and has a son and three daughters.

43.　 Two firefighters successfully r________________ the baby from the fire.

42.　 Jane and Betty are going on s__________________ holidays next week.