1) you ... stop here a) must b) must not c) may d) may not 2) Secur These are the expression of "prohibition", EXCEPT..   a) Don't speak loudly in the library b) Don't be cheating during exam c) You should wash your hands d) Don't be sad 3) You can use the word... to express an prohibition a) must not b) must c) should d) should not 4) "No smoking" means... a) we can smoke b) we may smoke c) we should smoke d) we must not smoke 5) we... be late to school a) must b) have to c) mustn't d) should

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