Are you concerned your mother when she is out in Africa?
| A．about |
| B．in |
| C．at |
| D．over |
. Several years later he ___ writer.
| A．become | B．turned | C．become a | D．turned a |
__ U.S.A. lies on the other side of ___.
A. The; PacificB. /; PacificC. The; the Pacific D. /; the Pacific
Beyond ___ stars, the astronauts could see nothing but _____space.
| A．the; / | B．/; the | C．the; the | D．/ ; / |
He is ___new comer to ___ chemistry but he has made a few important discoveries.
| A．/, / | B．a, / | C．a, the | D．the, the |
A large sum of money has been raised for the ____ of the poorly educated children in the mountainous districts.
| A．profit | B．favor | C．advantage | D．benefit |