7 the supermarket is not as convenient as a shopping center
8 Tom's grades are better than Tim 
9 No one in the family is happier than Pil
10 Your student is less good than her student?
11 Jame' friend is worse than Him
12 Mrs. Lan can't earn more money than her husband
13 That road is safer than this road
14 No one in the class is elder than your brother
15 He can do the exercise faster than anyone in the class
16  DN'restaurants are more expensive than HA'restaurant.
17 The homework yesterday was harder than he homework today