the pen costs nineteen yuan.改为复数句：
The pens cost nineteen yuan.
1.very beijing houses expensive are in .（连词成句）
Houses in beijing are very expensive
2.want powerful buy a to computer l.（连词成句)
I want to buy a powerful computer
3.3.A:what _____can____ l do for you?
B:l want to ______buy______ a computer.
A:what about this _____one______ lt has a big screen.
B:ten thousand yuan.oh,it is too _______expensive______
A:that purple is cheap.lt ____needs_________ three thousand yuan
B:lt's perfect.l'll get it