27.your / like / vacation /What /during /doing / you /do / ?
Phần trả lời:
27.What …………………………………………………………………………….

 By the time Isabel flew in an airplane, she _____ college.

is already finishing

will finish

had already finished

17. At the concert, the band performed a few _____.

a.music

b.old hits

c.new song