past simple or present perfect

1/ During last meeting, Mr Brown --- investing in the company but --- against it.

2/ He --- his flight again.

3/ She --- quite hard lately.

4/ They --- extra chairs yesterday morning.

5/ They --- the lobby these last few days.

6/ When we --- at the train station, it had already left.

7/ He --- in June.

8/ This room --- before last week's conference.

9/ I --- the report at 8pm on Friday.

10/ They --- very low prices.