11. I couldn't unlock it_______ I had the wrong key.
a. when b. while c. so as d. because
12. He had to take photos of the places he visits. _______, he's writing a report of his journey.
a. In addition b. Because c. However d. And
13. He thought the talk was fascinating. His friend, _______ fell asleep halfway through it.
a. although b. nevertheless c. however d. b or c
14. Olivia booked a babysitter_______ she could go our for the evening.
a. so that b. but c. so d. hence
15. _______ we had got ton the plane, it started to rain.
a. If b. While c. Before d. As soon as
16. Jane has a computer, _______ she doesn't use it.
a. and b. since c. but d. in spite of
17. It was cloudy. _______, the photos came out very bad.
a. Result b. As a result c. However d. But
18. You should bring an umbrella_______ it rains.
a. if b. unless c. in case d. because of
19. Mark heard the news on the radio_______ he was driving home.
a. while b. as c. until d. a or b
20. Everyone thought she would accept the offer_______, she turned it down.
a. However b. So c. Too d. Moreover
d a d a d c b c d a