根据已给出的首字母，在短文空白处填入适当的单词，是其内容通顺。每空限填一词，将完整的单词写在短文后面的横线上。
You are doing homework and waiting for you parents to come back. The doorbell rings.
You stand up and look t___1_ the keyhole. Two strangers! And the bell goes on ringing. Should you open the door at once?
Instead if o__2_ the door immediately, you should ask who’s there with the door locked, If it’s a stranger, say, “Come back latter.” Don’t tell him or her that your parents are a_3__. Say Mum’s in the kitchen or Dad’s taking a shower, To ignore(忽视)the doorbell is not a good I__4__. Sometime thieves ring doorbell to see if anyone’s at home.
In fact, there are many things that you should watch for when you are alone at home.
Keep the door I___5___ when you are alone.
Keep a handy list of phone numbers to call for help-110，the p_6____ department, or a nearby friend.
Never go anywhere with someone you don’t know, no matter h__7___ nice the person seems.
1．through 2．Opening 3．Away 4．idea 5．10cked 6．police 7．how