Academic Writing - Subject verb agreement&Pronoun Antecedent

1. The printer and the plotter we have bought (be) the best choice for us. 

• is

• are

• are being

• was

The new equipment is necessary to obtain the items of information that (be) going to buttress our research.

• have

• is

• are

• were

Gathering information without resorting to plagiarism (be) not easy in the age of the Internet.

• is

• was

• is being

• was being

The CD, together with the DVDs, (have) been stolen from the filing cabinet.

• were

• was

• have

• has

Everybody (know) that the economics of the timber trade (be) ruling that country.

• know, has

• knows, is

• know, is

• knows, has

Versatility in engineers (have) proved to be highly appreciated among employers.

• have

• has

• was

• is

 The analysis he made (be) rejected because the criteria he had chosen (be) neither specified nor homogeneous.

• was, were

• were, was

• has, were

• has, was

 Provided the data (have) been corrected and the hypothesis of the work (have) been adapted to our goals, the government may sponsor the research.

• have, has

• have, have

• has, has

• has, have

The decision of using recyclable materials and of modernizing the coffee facilities in the office (have) been welcomed by the staff.

• have

• had

• has

Frequent complaints (be) the battle that the quality department (have to) win.

• is, has to

• are, has to

• are, have to

• is, have to