It is ____ asking Tom for help, for he is always the last to help others.
A.useful | B.helpless | C.helpful | D.useless |
The little boy was so careless with his spelling that he often ________ letters from words.
A.left out | B.left behind |
C.left off | D.let alone |
Evidence obtained from observation and experiment is often used to ________ a scientific theory.
A.confirm | B.claim |
C.conclude | D.calculate |
.Faced with a problem,you have to ________ it first,and then try to find a solution.
A.resemble | B.substitute |
C.concentrate | D.analyze |
Teaching pronunciation class to a mixed group of learners can ________ a teacher with many challenging problems.
A.provide | B.produce |
C.present | D.offer |
All my pockets have been ________ but I can’t find my keys.
A.got through | B.given out |
C.gone through | D.gone down |