Поставьте глаголы в скобках в Present Perfect. 1) They …

1) They have elected the president of the company.2) The study has (indicated a connection between poverty and crime.3) have scientists observed a drop in ozone levels over the Antarctic? 4) He has not built a house.5) She has (printed this text.6) Where have you … been? 7) I have (seen him today.8) The computer industry has generated hundreds of new jobs in the area.9) Scientists have (identified the gene that causes abnormal growth.10) I have not been to the theatre for ages.11) John has been in France for three weeks.12) My sister has watched the film twice.13) Our letter has just arrived.14) How many books has Michael written? 15) A student has interpreted the text.