They are trying to make sure that 5G terminals_________ by 2022 for the Beijing Winer Olympics.

__________ the convenience of digital payment, many senior citizens started to use smart phones.

明代在城乡广泛设立一种对儿童进行教育的机构，他在招生择师、学习内容和教学活动等方面形成了极为完备的制度，这种教育的机构是()

Mr. Smith gradually _____ a knowledge of the subject.

--- Are you still mad at her?

---Not really, but I can’t ______ that her remarks hurt me.