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Ответ:

1.

1. in

2. on

3. in / at

4. on

5. ∅

2.

1. backpacking

2. platform

3. brochure

4. ship

5. reservation

3.

1. never

2. yet

3. just

4. ever

5. already

4.

1. Betty hasn't returned from the airport yet.

2. My best friend has just called me.

3. We haven't thought about it yet.

4. Pete has already done the shopping.

5. Have you ever been kitesurfing?

Объяснение: