problem
- The Math problem is too difficult , we really don’t know ________ to do it .
- It is no longer a problem _______ the poor children in this district can go to school.
- ________ the problem of land erosion(侵蚀) getting more serious, the government is searching for a way to deal with it.
- Only after he had spent several nights working on the math problem_______to wonder whether the problem was wrongly set．
- He knew the problem was serious and promised to look into it _____ he reached office.
- The problem lies __________ we are now giving him a fish, not teaching him to fish.
- This problem is said _____ three times.
- If you still have a problem,you can ask the police ______help.[ ]
- His problem is more difficult________ that one. [ ]
- I worked on the problem ____ a long time and I worked it out ____ myself ____ last.[ ]