1.what does he worry about?=what′s ----- -----?

1.what does he worry about?=what′s ----- -----?
2.He doesn′t know the answer ,so he can′t put up his hand.
If he ---the answer ,he ------ ------ ------ his hand.
3.It will be fine tomorrow.we will go fishing.(合并为一句）
we ---- ----fishing if it ------fine tomorrow.
4.what would happen if i don′t know anyone
------ ----- i don′t know anyone?
5He doesn′t know what he will say or do.(改为同义句）
He doesn′t know ------ ------ ------- or -------.
希望能快点......明天就要交了.....我写了好久了，