1.完成对话(一空一词）：Are they in the box?Oh!They aren't ( )2.完成对话(一空一词）：It's five o'clock in the afternooon,Tommy wants( )basketball.(plays/to play/play)3.完成对话(一空一词）：I( )a new bike ,but my sister ( )第3题填写“我没有新自行车，但我姐姐有。”选项有：don't have ;does.not have;does.另外再问一道题哈：为什麽look an this photo。要用an呢？

上面的已经解释过了，就不说了．
至于补充的问题．．．．．．你看错了吧？应该是AT．
LOOK AT 是固定结构．

1.完成对话(一空一词）：Are they in the box? Oh!They aren't (any )
2.完成对话(一空一词）：It's five o'clock in the afternooon,Tommy wants( to play)basketball.(plays/to play/play)
3.完成对话(一空一词）：I(have )a new bike ,but my sister (hasn't )
答案满 意吧。我是英语教师 不明可再问。

there 代替in the box
to play want后面跟不定式,表示想做什么
have hasn't 根据人称来选择have or has,第一人称用have,第三人称单数用has

there instead of in the box
to play want the back with the infinitive, that want to do what
According to the person to have hasn't choice have or has, with the first person have, to use third-person singular has