The speaker _____ several other subjects inthe course of his talk but mostly kept himself to the main topic

下列各句中没有语病的一句是（ ）

Lucy _________ really quiet but now she isvery outgoing. —Yes. She has changeda lot.

The performance will be given next weekYou can go to the student union tickets

Is Andy able to finish the work alone— I’m afraid not. It’s his ability.