Mr. Smith is ________a teacher. He is also our good friend.
| A．only | B．more than |
| C．no more than | D．nor more than |
I think Jack will ________ a good monitor，so I’d like to vote for him.
| A．turn | B．change |
| C．make | D．elect |
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 |