33 New devices have been invented by scientists to help people live a longer life
34 If I had enough time, I could travel around the world this summer
35 She asked me where I was going
36 The waitress asked the little boy if/whether she wanted her to call his Mom
36 If I knew the answer, I would tell you
38 Most people had left before the volcano erupted
39 This time tomorrow, I will be playing badminton with my friends
40 He asked if I knew the way to Nguyen Tat Thanh Square





