Question

Yuan Longping did all he could ________ himself ________ the scientific research on rice．

1. A.
   to apply; to
2. B.
   to apply; for
3. C.
   to apply; at
4. D.
   to devote; for

Answer 1

A
apply oneself to…意为“专心于……；致力于……”。apply for意为“申请”。devote oneself to…意为“奉献于……；致力于……”。