How about buying Sam a mobile phone? After all, he isn’t a boy any more.— I think it necessary, for we sometimes want to make sure if he _______ home for dinner[ ]

e past 20 years, the Internet has helped change our world in _______wayor another for the better.

We should keep our eyes _______ while doing eye exercises.

In order to stop poverty,the World Bank has ___its focus to providing technical assistance and long-term loans to developing countries.

下列各句中没有语病的一项是（    ）