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III.Put the verbs in brackets into the present perfect or present perfect continuous.
1.You … (clean) the house for hours. Why don’t you have a rest?
2.It’s the most beautiful yard we … (ever/see).
3.I … (wait) for you since 8 o’clock this morning. Where … (you/be)?
4.How long …. (Kate/study) Spanish?
5.Sue can play the flute very well. She … (take lessons) for six years.
6.I … (be) to the UK twice.
7.She’s tired. She … (iron) for four hours.