1. Li Hua has __________ good knowledge of the English language and this will be an advantage over others in finding __________ proper job.
A. a, the B. a, a C. /, a D. /, the
2. Some people do not have enough to eat while some others throw away food just__________ its poor taste.
A. because of B. according to C. instead of D. in spite of
3. Scientists say it will be five or six years __________ it is possible to test this medicine on humans.
A. after B. before C. since D. when
