The key answer of exercise 9

a)

1. although; while
2. so ... that; such ... that
3. unless

b)

• Review 2 → although (line 9)
• Review 3 → unless (line 1); While ... (line 7); so ... that (lines 8-9)

c)

1. Starbucks has been so successful that now they want to open new stores in China.
2. The restaurant has had such bad reviews that nobody wants to go there.
3. I won't go back there again unless they get a new chef.
4. Although the food was delicious, the service was poor.
5. While the restaurant had a good atmosphere, the food was disappointing.