Упражнение 5. Раскройте скобки, употребив формы Present Perfect или Present Perfect Continuous:

1. We (walk) ten kilometres already. 2. We (walk) for three hours. 3. I'm on a diet and I (eat) nothing but apples for the whole week. 4. He (sleep) since ten o'clock. It's time he woke up. 5. The students (work) very well this term. 6. I (work) with him for ten years and he never (say) "Good morning" to me. 7. You (hear) the news? Tom and Ann are engaged! 8. How many baskets of apples you (pick)? It seems to me you (to pick) them for 3 hours already. 9. You (see) my bag anywhere? I (look) for it for half an hour.