Subject-verb agreement with “number,” “range” and “total”

Collective nouns such as number, range and total can be troublesome in terms of subject-verb agreement. In the sentences below, decide whether the sentence needs a singular or plural verb.

1. The number of survey respondents Placeholder for the answer dismally low.
2. A range of dresses Placeholder for the answer been designed for the fashion show.
3. A number of partygoers Placeholder for the answer dressing up for the occasion.
4. A total of 12 students Placeholder for the answer chosen to go to Paris.
5. The total of the company's assets Placeholder for the answer staggering!
6. The range of ideas at the conference Placeholder for the answer very inspiring.
7. A number of candidates Placeholder for the answer tied for first.