40 Great as Newton was, many of his ideas ____________ today and are being modified by the work of scientists of our time.

A) are to challenge B) may be challenged

C) have been challenged D) are challenging

41 Please be careful when you are drinking coffee in case you __________ the new carpet.
A) crash B) pollute
C) spot D) stain

42 I’d rather read than watch television; the programs seem _________ all the time.
A) to get worse B) to be getting worse
C) to have got worse D) getting worse

43 Convenience foods which are already prepared for cooking are ________ in grocery stores.
A) ready B) approachable
C) probable D) available

44 When I caught him ________ I stopped buying things there and started dealing with another shop.
A) cheating B) cheat
C) to cheat D) to be cheating

45 It is important that enough money __________ to fund the project.
A) be collected B) must be collected
C) was collected D) can be collected