1.with

E.g. We(不用are) not only can send email with( 不用by) words, but also with photos and videos.

2. Juvenile male female ?? adj.

? ?Juveniles males females ?? N. Plural

? ?A juvenile person?? N. single

A male person

A female person

3. There are 15% points students like sport more than art, at 45% and 30% respectively.

不能直接用15%, 要用也是 50%.