1. I don’t believe that a third of__________ should be paid in tax.

A. the person’s income                               B. a person ’s income

C. person’s income                                    D. person income

2. The number of loyal customers__________ on the rise thanks to the company’s effective advertising campaign.

A. is                               B. are                             C. am                             D. be

3. I try to go jogging at least four times __________.

A. the week                    B. of the week      C. a week             D. of a week

4. People__________ always willing to switch to a better product.

A. is                               B. Are                  C. Be                    D. Am

5. Too much rubbish is being dumped in__________.