Is that your backpack?Yes,it's ___ backpack.A his B her C my D your

Is that your backpack?Yes,it's ___ backpack.A his B her C my D your
Two notebooks ___ in the lost and found case.A / B is C are D am Mom,I'm late for school today.You need a ___ to wake you up next time.A ruler B clock C pencil D computer ,对,快