If I had a typewriter, I (type) _________________ it myself

21. If I had a typewriter, I (type) _________________ it myself.
22. If I (know) _________________ his telephone number, I'd give it to you.
23. If she _____________(not invite), I won’t come.
24. I’ll probably get lost unless he _______________ (come) with me.
25. If we lived in a town, life (be) ______________ easier.