1 are (рыбки как питомцы, не рыба как еда)
2 are (пара - это 2 человека)
3 is (совет - неисчисляемое)
1. Our suppliers regularly change prices once a month basing on the currency exchange calculations.
2. Internet fraud increases in many European countries.
3. What does she do? - She is an executive secretary.
4. People usually demand higher salaries when inflation goes up.
5. I deal with with Sue’s clients while she is on vacation.
6. What are you doing? – I am sending the invoice details.
7. They operate in London, and now they are setting up new offices in Beijing.
8. Where do you work? – London this month, then Moscow the next.
9. This computer always breaks down.
10. Today managers need a new approach that relies more on communication and less on command.
Is
Is
Are
Объяснение:
Думаю это правильный ответ