根据上下文，选择合适的单词填空

         one        think         this          well          correct

    Maybe everyone has trouble in learning new words. It is not easy to remember and use them   

1.____. The following suggestions will help you a lot. It can be a good idea to divide (划分) the new

words into groups according to the meanings.  2. ____ about the connections (联系) between words

may help you to remember them. The more you practice, the  3.____  you will use them. You can also

write a list of some new words. Express your ideas with them and discuss the uses of   4.____  words

as much as possible. However, there is one more thing you should pay attention to. Don't try to learn

too many words at one time. Choose several important  5.____  to you. Repeat their pronunciations,

spellings as well as their meanings in your mind. Learn a little every day and you will learn a lot in a few

years. It is the skills that can make you learn new words easily. It is the skills that can help you know

more words quickly.

劳动行政部门在收到集体合同后的()天内未提出异议的，集体合同即行生效

A．7天

B．10天

C．15天

D．30天