In each mini-dialogue put one verb into the present perfect simple and the other into thepresent perfect continuous.

1. A: What’s the matter? You look worried! B: Yes, I am. I\'ve been looking at the contract in detail, and I\'ve noticed a lot of potential problems. 2. A: I have been calling Carol all day, but it goes straight to voice mail. B: I expect she has gone to Head Office. 3. A: \"Tosca\" is coming to the Opera House. Have you seen it? B: Not yet, but I have been looking forward to it for ages. Shall we go together? 4 A: How long have you been producing cars at this site? B: About four years. We have invested around twenty million dollars in plant and machinery.