Тест по английскому умоляю помогите решить..

13. He ...on the phone when Linda ...into his office.
(a) was speaking, came (b) spoke, was coming (c) speaks, comes (d) spoke, came

14. They ...already ...the gooods.
(a) did ...deliver (b) do ...delivered (c) are ...delivering (d) have ...delivered

15. We ...to Lisbon next Friday.
(a) go (b) have gone (c) are going (d) went

16. He will do it when he ...back from his business trip.
(a) will come (b) comes (c) came (d) is coming.

17. They ...writing the report just before he ...
(a) finished, returned (b) had finished, returned (c) finished, had returned (d) had finished, had returned

18. ..did they travel? - by plane.
(a) When (b) How (c) Why (d) Who

19. ..do you work with? - Bertha.
(a) When (b) How (c) Why (d) Who

20. ..do they have a staff meeting? - Once a month.
(a) How old(b) How often (c) How long (d) How much

21. ..are you going to return? - Next Tuesday evening.
(a) When (b) How (c) Why (d) Who

22. ..colleagues are there at the conference?
(a) How many (b) How often (c) How long (d) How much

23. You ...switch off your mobile during the conference.
(a) can to (b) should (c) havey (d) can't

24. ..you come to the office at 9. a.m. tomorrow? - Sure, no problem!
(a) can (b) should (c) have (d) can't

25. They ...leave their workplace without permission. It's against the rules.
(a) can to (b) should (c) mustn't (d) needn't to

26. You ...stop smoking! It's bad for your health!
(a) can't (b) have (c) needn't (d) must

27. This ...be John. I'm not sure.
(a) can (b) must (c) should (d) maybe