----- Nội dung ảnh ----- 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.