They are fighting _____ us _____ the enemy[ ]

My brother loves playing_______volleyball. Look! He is playing with _______volleyball over there.

What I want tototeenagers is that being addicted to the Internet will to some extent do harm toboth mental and physical health．

Jack is good at maths and doesn’t perform well in English.–_____.

n 1918 and 1938, many new stations were constructed,__________ was designed by an architect named Charles Holden.