3. Complete the sentences with the correct form of the word from the brackets.

11) When I _____ (filled in / was filling in) the application form, I saw my previous employer.
12) You _____ (should / must) carefully dressed for the interview.
13) The secretary _____ (read / was reading) the cover letter, when the telephone rang.
14) You _____ (shouldn’t / mustn’t) be late for the meeting.
15) In 2008 I _____ (worked / has worked) for an American company.
16)
17) One _____ (has to / may) earn money to support his or her family.
18) 2 years ago he _____ (had done / did) a few training courses.
19) You _____ (have been working / were working) since the early morning. You should make a break.
20) Persuade the director that you are just the man he _____ (needs / needed).
21) As for your job I am sure we _____ (will come / come) to an agreement.
22) Charles _____ (has been looking / looked) for a job for 6 months.
23) He _____ (finished / had finished) writing the letter of recommendation by noon.
24) I _____ (am / being) available for an interview at your convenience.
25) He _____ (must / had to) leave his firm because it became bankrupt.