将下列句子合并为带有宾语从句的主从复合句.
1.Why hasn't Linda come to the party?Lucy wants to know.
Lucy wants to know( )
2.Where can I find my English book?Do you know?
Do you know( )
3.How much did she pay for the bike?I want to know.
I want to know( )
4.Did Lily go to school by bike this morning?I don't know.
I don't know( )