The key answer of exercise 5

Sentence 1: although → though
Sentence 2: Despite the fact of → Despite the fact (that)
Sentence 4: Even though → Although
Sentence 5: Jam packed when it can be → Jam packed though it can be
Sentence 6: Albeit → However
Sentence 7: Important if it is → Important though / as it is
Sentence 10: indifferent you can be → indifferent you are
Sentence 12: even though → albeit

The key to exercise solutions in chapter 6.1 for the textbook Speakout Advanced Plus - Workbook with authors Richard Storton from Pearson Education

Chapter

Exercise