横线上要填的连接词应该是or.对等连接词or用在否定句中,连接并列成分,表示“和”或“也不”,这句话表示“在铅笔盒里没有钢笔和铅笔”.因为这是一句否定句,所以表示“和”的时候不能用and,而要用or,如:
We can't go to parks or swimming pools.
I couldn't take the CET-4 or CET-6.
The notebook doesn't belong to you,him or me.It beliongs to our teacher.
希望我能帮助你解疑释惑.