1. be believed to be

　　2. be estimated to be

　　3. distinguish between A and B/ distinguish A from B

　　4. rates for（when ‘rates’ means prices charge）

　　5. the cost to sb of doing sth； cost sb sth in sth

　　6. attribute A to B； B is attributed to A

　　7. in the coming moth

　　8. admit that SVO/admit to sth

　　9. introduce into

　　10. in an attempt to

　　11. known to do sth/known to be sth/known as sth；/known for sth

　　12. the extent to which

　　13. be necessary to do/the necessity of doing/sth

　　14. consider n1 n2

　　15. in danger of

　　16. cite A as an instance of B； for instance

　　17. all things adj/all the adj things

　　18. credit[v] sb with having done/the credit[n] to sb for having done

　　19. substitute A for B

　　20. be expected to

　　21. both A and B

　　22. demand that s v o； [‘demand s to do’ is wrong.]

　　23. mistake A for B.

　　24. all of which [can not be ‘of which all’]

　　25. at a time when/ the year that/the period when/ an age in which