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1·Before the payment of these tariffs, the imported goods will be in the custody of the customs.

接关税后，进口货物由海关保管。由于语法限造，只需用实词。

2·A. For the purposes of Canada Customs, children are classified as being under the age of 16 and require parental custody and control.

答： 依据加拿大海关的规定，儿童的定义是指16岁以下并且需要 “监护权及控制”。

3·TARIFF AND DUTY RATES 1. Types of Duty: Import Duty Import duties are levied on any imported goods before releasing them from the custody of Customs;

关税和税率一、关税种类：·进口税除了符合法规给予免予征收关税特权的商品之外，任何进口商品在过海关时都要征收进口税。