Bài 5: Khoanh tròn vào liên từ thích hợp để hoàn thành những câu phức dưới đây.
1. It will be a great fortune (if/unless) I can join upcoming carnival.
2. I will lend you my book (as long as/as soon as) you promise to keep it clean.
3. I will call you (as long as/as soon as) I arrive there.
4. (When/While) I came, Jim was having dinner.
5. Catherine was shocked (when/until) she found out the truth.
6. They have worked at this company (when/since) they graduated.
7. At 8 pm last night, I was doing my homework (when/while) my sister was playing with her toys.
8. (Before/After) I had eaten my breakfast, I went to school by bus.
9. (Although/Despite) Mary looks thinner than me, she is much stronger than me.
10. They didn’t come to the party (since/as soon as) they were too busy.
11. You should bring your raincoat (unless/in case) it rains.
12.I didn’t realize her new hair (when/until) she told me.
13.I won’t accept this job (even if/if) the offer me high salary. 
14.My father will buy me a book (even though/as long as) I pass the exam.
15.I like her (when/even though) she’s annoying sometimes.