Ответ:
My mom works operator in the source. She is always very busy. At work, there is its own work clothes it must be observed. At the work they produce different products, and sell them. What would have more people saw goods, they cooperate with other companies.
2.needn't
3.can
4.needn't
5.needn't
6.can
7.mustn't
8.can
9.mustn't
10.mustn't
Будет an, ибо он всегда используется с гласными, н/п: an Apple, an egg
А а используется с согласными, н/п: a banana
Да и по звучанию посмотри, a omelet произносится очень грубо, нежели an omelet.