WE BELIEVE SCIENTISTS WILL _______ A WAY TO SOLVE THE PROBLEM OF A...
19. We believe scientists will _______ a way to solve the problem of air pollution,
a. set off
b. put off
c. come up with
d. catch up with
19. We believe scientists will _______ a way to solve the problem of air pollution,
a. set off
b. put off
c. come up with
d. catch up with