Choose the best answer

16. She's at her best when she________ big decisions.

A. is making     B. makes        C. had made          D. will make

17. We________ next vacation in London.

A. spend       B. are spending      C. will spend         D. are going to spend

18. Robert________ tomorrow morning on the 10:30 train.

A. arrived      B. is arriving        C. has arrived        D. would arrive

19. Look! The bus________ 

A. left        B. has left          C. leaves            D. is leaving

20. Mike________ one hour ago.

A. phoned       B. was phoning       C. had phoned      D. has phoned