VI. Определите правильный вспомогательный глагол в предложениях.

1. … you know which currencies you need for your travel?
a. are b. have c. do

2. Why … the cash flow of this firm come from many sources?
a. do b. does c. is

3. When … this company pay its last dividend?
a. do b. does c. did

4. Accounting information … used to prepare financial statements.
a. is b. does c. did

5. The double-entry bookkeeping system … invented by Luca Pacioli during the Italian Renaissance.
a. is b. was c. will be