Choose the correct answer

17. Current liabilities are debts that must be paid
A. by
a year.
C. with
D. until
B. within
18. The source of this information is very trustworthy, which leaves no room for
A. read
C. belief
B. doubt
19. A number of automobile
A. renting
B rents
20. The scientific method is the
A. basic
B. basis
D. authorize
agencies are located on the lower level of the airport.
C. rental
D. rented
of all scientific research.
C. basing
D. base