North Korea threatens to ________ from six-party talks aimed at ending North Korea’s nuclear program unless its proper rights are to be satisfied

Once you _____ used to the weather here, you _____ to live here.[ ]

Tom asked my friend ______.

The electronic red-packet has been so ______ that AliPay and Tencent Wechat compete against each other openly and secretly since the beginning of this year.

more learned a man is, ______more modest be usually become.