2) The resturant serves burgers and sandwiches; The former tend to be more fattening.
以上句子中的"tend", 為甚麼不必加s?
3) With her arms crossed, Mom stared at the boy.
為何不是were crossed?
4) The birds fly high.
為何不是highly?
5)為何北非屬於高度發展國家? 北非不是很落後嗎?
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