Question

Good!
Use Present Simple or Present Progressive.
Tim's father is a famous detective. He sometimes
(work) on interesting cases.
Right now he
(work) on a new case. It is in all newspapers. He is always busy and he
(work) very hard. He
(read) long reports, he
(write) his own
notes, and he
(interview) many people. Tonight he is going to appear on television to
tell about the case he
(work on) at the moment. Usually he
(keep) quiet
about a case until he has some possible solutions. Everybody
(think) that he is an
excellent detective.

Answer 1

he sometimes has worked

has been working

has worked

has read , has written , has interviewed

has been working on

has kept

has been thinking