The world’s population is getting larger and larger, so scientists are trying to ______ new ways to solve the food shortage.
A.keep up with | B.come up with |
C.make up with | D.catch up with |
The world’s population is getting larger and larger, so scientists are trying to ______ new ways to solve the food shortage.
A.keep up with | B.come up with |
C.make up with | D.catch up with |