The sound is lost when the next word begins with a consonant (last week, good movie, can't remember, it now), but the sound is NOT lost when the next word begins with a vowel (watched a, but I)
Explanation
B - sensitive C - tourist D - manners
C is the general definition of 'manners', while D is specifically 'table manners'. A and B are ways to be a 'sensitive tourist'.
C & D - the punctuation is wrong because there should not be a comma. A - this means it wasn't necessary, not that you weren't allowed
A & B - no infinitive verb after 'have to' & 'must' C - don't have to means it isn't important, so they can or can't it doesn't matter
A - must doesn't exist in the past tense B - hadn't to is grammatically incorrect - use didn't have to (but the meaning would still be wrong) C - the meaning is wrong - this means it wasn't necessary, not that it was obligatory not to
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