Завершите предложения, используя предлоги и / или союзы Complete the sentences using prepositions and/or conjunctions:

1. Allan is uncertain ... this job. He is undecided ... to accept or to refuse.
2. I'm really puzzled ... the results of the experiment.
3. Our chief is doubtful ... the new research program.
4. I am not sure ... to establish new points of reference in my lecture.
5. John is not always careful ... what he says.
6. Who is responsible ... this is adequate.
7. We are doubtful ... this is adequate.
8. Jane is sure ... her success.
9. Jill is certainly not adequate ... this job.
10. She is not very acquisitive ... new ideas.
11. Are you always particular ... the subject of your research?
12. John is a brilliant student. He is good ... all the subjects.
13. The idea is good, bot not relevant ... the issue at stake, I'm afraid.