( ) Complete the sentences using the brackets. Use the past perfect tense.

1 By the time they reached Australia, they___ already___ 8000 miles. (sail)

2.European___never __a kangaroo until Australia was discovered. (see)

3.I saw the photos Gagarin __ __ from out space.(take)

4.Hawaiians__never __Europeans before Cook arrived. (met)

5 The plane__ __ somewhere over the sea so it was impossible to find .(crash)