I am (n ) happy.because my pencil case is(l )
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I am (not ) happy.because my pencil case is (lost )
======以下答案可供参考======
供参考答案1:
not lost
供参考答案2:
I am (not) happy.because my pencil case is(lost ) .我不高兴，因为我铅笔盒丢了。或者（ I am not happy, because I lost the pencil case）
供参考答案3:
not lost
我不高兴 因为我的铅笔盒丢了