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Exercise 4. Complete the following sentences using the present perfect continuous forms of the verbs in brackets.
1. He ________________________ (wait) all the morning.
2. Richard ________________________ (do) the same job for 20 years.
3. I ________________________ (study) English for six months.
4. Mike ________________________ (work) in Las Vegas for the last few months.
5. It ________________________ (rain) since lunchtime.
6. Helen ________________________ (read) this book for three days.
7. Kevin ________________________ (look) for a job since he finished school.
8. I’m tired of waiting. I ________________________ (sit) here for one hour.
9. He is exhausted because he ________________________ (work) continuously for more than twelve hours.
10. She ________________________ (sleep) for 10 hours! You must wake her up.
11. He ________________________ (read) this book for two hours, but he hasn’t finished it yet.