他看电视的时候睡着了。

He fell asleep ___while watching TV.

虽然他很有钱，但他从不炫耀。

___While he is very rich, he never shows off.

她喜欢安静地读书，而她的妹妹更喜欢参加派对。

She enjoys reading quietly, ___while her sister prefers going to parties.

我们在咖啡馆闲聊，消磨了整个上午。

We ___whiled away the whole morning chatting at the cafe.