2)Educators and parents believe that they need to pay ____ ____ effort to make the Internet a safer place for children.
3)Children in families with home computers spend ____ ____ time watching television than those without computers.
4)Nowadays, ____ ____ students are using varied forms of Internet technology to improve or demonstrate their learning.
更新1:
有兩條底線既係兩個字梨個囉唔該!