He failed the exam ________ he was too careless.

It is so wet there that the trees are extremely tall, some ________ over 90 metres.

Have you been to New Zealand?— No, I’d like to, ________ [ ]

He plays well or badly according to his mood (心情), so he’s a very _________ player.

Vitamin D helps our bodies make a special chemical,and this special chemical, ____ , affects our brains,making us feel happy.