补全对话(5小题，每小题2分．共10分)

根据下面的对话情景，在每个空白处填上一个适当的句子，使对话的意思连贯、完整．

并将答案写在答题卡相应位置。

A: Hi, Jim. I phoned you at 5 o'clock yesterday afternoon. But nobody answered.

小题1:                                                      ?

B: I was shopping with my mom at Dennis.

A: Oh, that' a good place for shopping. By the way,小题2:                              ?

B: No, we didn't. We just used the plastic bags offered by the shop.

A: Oh, no! You should take your own shopping bags.

B: You're right. 小题3:                                                .

A: Tomorrow, we will go to clean up the city parks,小题4:                              ?

B: Sure. Let's join together to save the environment.  小题5:                              ?

A: Let's make it 8:00 in the morning at the school gate.

B: Ok, see you then.

在某段电路中，其两端电压为U，通过的电流为I，通电时间为t，若该 电路电阻为R，则关于电功和电热的关系，下列结论正确的是（　　）

A．在任何电路中，电功W=UIt=I²Rt

B．在任何电路中，电功为UIt，电热为I²Rt

C．在纯电阻电路中，UIt=I²Rt

D．在非纯电阻电路中，UIt＞I²Rt