英语问题 急救啊！

1.step by step.
hand by hand.
the name of the book
one by one
side by side/
shoulder by shoulder
Of可以加很多，
BY 你也可以做 foot by foot,==

2.be anxious about
be worried about
be nervous about
be stress about
be optimistic about
be enthusiastic about
be glad about
be sad about
be disppointed about
be rude about

3.look for
search for
seek for
wait for
stand for
eat for
study for
watch for
research for
pay for ...

hand in hand/ mouth to mouth /step by step/shoulder on shouder/day by day/year after year /

look for/sent for/hunt for/