14. Most birds find it safe to sleep in the trees, but ______ they have eggs or young chicks, they don’t use a nest.　　　

A. why　 B. how　 　　C. unless　 　　　D. where

13. You will be successful in the interview ______ you have confidence.　　　

A. before　　　 B. once　　　 C. until　　　 D. though

12. Leave your key with a neighbour ____ you lock yourself out one day.　

A. ever since　　　 B. even if　　　 C. soon after　　　 D. in case

11. ______ he had not hurt his leg, John would have won the race.　　

A. If　　　 B. Since　　　 C. Though　　　 D. When

10. I won’t call you, _____ something unexpected happens.　　

A. unless　　　 B. whether　　　 C. because　　　 D. while

9. You can go out______ you promise to be back before lunch.

A. so as to　　　 B. as long as　　　 C. so that　　　 D. so far

8. _____ you call me to say you’re not coming, I will see you at the theatre.

A. Though　　　 B. Whether　　　 C. Until　　　 D. Unless

7. In some countries, you mustn’t touch ________.

A. someone’s head　 　　　　　　　　B. someone in his head　

C. someone on the head　 　　　　　　D. someone head

6. I tried to avoid ______ him because he bored me.

A. to meet　　　 　　　　　　　　　B. not to meet　　　

C. meeting　　　 　　　　　　　　　D. not meeting