Раскройте скобки, употребляя глаголы в present perfect или past simple. 1. we (to travel) to lots of countries. 2.mrs. green (to work) in the office for 25 years. and she is still working. 3. she (to ring) her boss yesterday. 4. the lecture (not yet to begin) and the students are talking in the class room. 5. i (not to see) him since 1987.