1.of the five students mary is the smartest
→among........
2.my father drank so much coffee that he couldn't get to sleep
→my father drank much....
3.he hid the letter in a drawer because he didn't want anyone to read it (so that)
4.i didn't bring my camera,so i can't take a photo with you now
→if.....
5.he is so stupid that he can't understand the lesson
→he is such.....
6.people belive that mario's family brought up that little girl in Italy
→that little....
7.the first world war began in 1918 (broke)
8."you've spoiled my party" he said
→he accused.....
9.during his law studies he met a future wife
→while.....
10.it took me a fairly long time to answer all my e-mails
→i spent....
11.city centers are more dangerous than they were 20 years ago (safe)
12.she has never eaten lobster before
→this is the....
13.please help your mother with the housework
→i'd rather....
14.it's time for children to go to bed
→it's high time....
15.the flight from ho chi minh city to singapore only takes 3 hours
→it takes.....
