In each mini-dialogue put one verb into the present perfect simple and the other into thepresent perfect continuous. Use contractions where possible.
1 A: What’s the matter? You look worried!
B: Yes, I am. I ’ve been looking at (look at) the contract in detail, and I ’ve noticed (notice) a lot ofpotential problems.
2 A: I (call) Carol all day, but it goes straight to voicemail.
B: I expect she (go) to Head Office.
3 A: ‘Tosca’ is coming to the Opera House. (you see) it?
B: Not yet, but I (look forward) to it for ages.Shall we go together?
4 A: How long (you produce)cars at this site?
B: About four years. We(invest) around twenty million dollars in plantand machinery.