What do you mean _____ signing the letter for him?[ ]

_________all of them are strong candidates, only one will be chosen for the post.

I called you at nine this morning, but there was no answer.— Oh, sorry, I ______ with my sister in the shopping center.

Dear, I can find a better job if I go to Germany, maybe.— Don’t be silly. ________, you know.

It is importantpeoplelearn team spirit.