Chọn câu trả lời đúng

                     Khoanh tròn câu trả lời đúng 
  1.Yesterday, Jim was playing the piano _________ his sister was playing the flute. 
A. as                        B. although                           C. while 
 
    2.  You shouldn't spend too much time on computer ________ it is harmful to your eyes. 
A.  as                       B. when                          C. although 
 
     3. I will phone you _________ I get there.
A. while                        B. as soon as                         C. until 
       4. The scientist usually works in his lab ______ the sun sets.
A. until                     B. as soon as                        C. although 
        5.  ________ you promise not to tell lies again, I won't forgive you. 
 A. If                            B. Even if                            C. Unless 
         
         6. _________ her legs were hurt, she made attempt to finish the running track.
A. Even if                     B. As if                      C. Even though 
 
         7. She talked _________ she witnessed the accident. But in fact she knew nothing.
A.  as if                 B. even though                    C. even if 
          8. I didn't finish my homework _________ I was seriously ill yesterday.
A. when                    B. though                             C. since 
 
           9. James decides to save money from now ______ he has enough money to travel this summer.
A. so that                    B. though                            C. when 
 
           10.  _________ we have been friends for only one year, we deeply understand each other.
A. If                           B. Though                           C. Once
 
            11.  Mr. Smith doesn't like dogs, ___ his wife loves them. 
A. when                      B. so that                          C. whereas 
 
            12.  I was cycling home yesterday _________ I saw Jim standing near the fountain.
A. when                        B. while                               C. since