Her parents’ quarrelling with each other _________ is the main cause of her family’s breaking up.

下列各组词语中，没有错别字的一组是（ ）

The TV play You Who Come from the Stars is popular recently.—-Yes. It is the only program _______ I watched this month.

Our government has taken some measures to overcome thelack of electricity, but it may takesome time ____ we have enough power.

Xian, the ancient capital of the six dynasties, is becoming ________ international city and attracts more and more foreign tourists every year.