If a girl doesn’t know _____ to wear, she can ask her best friend for help.

My grandpa is a science teacher and he_____ science. [ ]

What useful book it is!—Yeah, it tells you how to play guitar.

If you still have a problem,you can ask the police ______help.[ ]

It was there, the police believe, _________ she was able to activate the recorder she kept in her bag.