根据对话情景，在空白处填入合适的句子。

A: Tomorrow is Sunday. __1__?

B: I'm going to visit my uncle's farm with my father, Betty.

A: Where's his farm? __2___?

B: No, not very far. It's about half an hour's walk.

A: May I go with you?

B: Sure.

A: __3__?

B: We'll go there by bike.

A: __4___?

B: Let's meet at the park gate.

A: OK. But when shall we meet?

B: __ 5___ seven in the morning.

A: All right. See you tomorrow.

B: See you.

车库内动车前，必须做好“四确认”。包括确认股道、列车及触网送电情况、确认（）、无异物侵入限界、确认进路无人或无障碍物侵入限界、确认（）。