My mother (buy) ... me an English dictionary for my last birthday

1 what / expensive car
2 my brother/ go / ho chi minh city / since 2012
3 if / she / work / hard / pass / exam
4 my mother (buy)               me an English dictionary for my last birthday
5 I ( never,see)            such a big flower
6         they (clean)            the car every week?
7 if we plant more trees , the air (not,be)          so polluted
8 sweden's capita city is built on 14(1)        and has a 7
9 here you can (2)          the Royal palace
10 there are about 3,000 people living in the old town (3)      
11 except for the nobel (4)     prize