1 We are certain that he will get over his illness．
A sure
B happy
C surprised
D excited
2 A research center has been set up in this country
A praised
B established
C reformed
D criticized
3 If headaches only occur at night，lack of fresh air is often the cause
A deliver
B fall
C happen
D arrive
4 The ice is not thick enough to bear the weight of a tank．
A suffer
B accept
C receive
D endure
5 A small number of firms have stopped trading
A hotels
B shops
C restaurants
D companies