1.Have you ever been to London ? - Yes, I (have been) there several times. - When were you there last? - I (was) there last a month ago. 2. Have you ( seen) Mary this
week? - No, I have not. But I (saw) her last month. 3. When did you (
enter) the Nautical College? - I (entered) it last autumn. 4. The
ice-breaker Sibir has just ( arrived) at the pilot station. 5. We (have
learnt) about our text voyage lately. - But I ( knew) about your coming
voyage three days ago. 6. When did you ( make) your first voyage? - I (
made) it four months ago, but my brother has just (been put) to sea. 7. The
sailors have already ( launched) the life-boat. - When did they ( lift)
life-boat No 2? - They ( lifted) it 10 minutes ago.