Какой корень у слова черепица?

they're working on the project, ...?

it wasn't my fault, ...?

billgot want he wanted, ....?

it won't be hard to convince her, ...?

we can't leave him alone, ...?

we've done our job, ...?

you should apologize for what you have done, ....?

they didn't start the meeting at two o'clock, ...?

they finish work at five o'clock, ...?

she doesn't like him, ...?