题目内容：

阅读下面材料，在空白处填入适当的内容（一个单词）或括号内单词的正确形式。

(When Sara came home from work. she found her mother in an anxious state)

Sara: What's wrong, Mum? You seem upset.

Mum: It's your 1.   (young) sister Jill. She should have been here 2. hour ago.

Sara: Don't worry Mum! It's not all that late and she has  3.   (probable) not realized how late it is. I think she'll be here soon.

(Just then Sara's brother Peter came into the kitchen)

Peter: What's up? Mum's on the phone and she seems as though she's going try[

Sara: It's Jill. She should 4.    (reach) home by now and Mum's getting anxious.

Peter: You needn't feel so anxious. Mum! You know  5.  teenage girls are like. I'm sure she's all right.

Mum: I can't help but be concerned. I've just rung Lucy and she said Jill left her outside the cinema ages ago to get the bus home.

Peter: Well, the bus service isn't very frequent  6.    the evenings. Perhaps she missed one and is waiting for another. Have you tried  7.    (phone) her on her mobile?

Mum: Yes. But there's no reply. That made me even more worried. I think  8.  must have happened to Jill. Do you think we should call the police?

Sara: Calm down, Mum! You'll make yourself ill. Perhaps she switched her mobile  9.   in the cinema and forgot to switch it back on again. Or it may need 10.(charge) .