at first ,you should think about the size of the rice cookers.对 the size 提问.
____ _____ _____ think about of the rice cooker at first?
the cost of rice cookers is different .改为疑问句.
some cheap cookers can cost less than＄ 40 .对 less than ＄ 40提问
_____ _____ ______some cheap cookers cost?