I need .............. some emails

The situation is difficult ...........

I don't know what ...............

I really don't mind ...................

........................... is my favourite sport.

................. bring our books tomorrow?

It's free. You ................ pay.

You must ............... your mother.

You .................... drink so much coffee.

I think you should ............... to her.

If she ................., she won't come back.

If they don't come soon, we ....................... them.

Call me if you........... a taxi.

Whose book is this? It's .............

She forgot about his birthday, but he didn't forget about ................