Only after he realized the significance of mastering two languages ______ English carefully.

Sir, Jenny wants to know when she can leave the office.—– Only when she ______ copying this report.

They put forward a lot of plans at the meeting, but none of _______ were carried out in their work.

下列各句中没有语病的一句是（ ）

Just a month before the earthquake the school practiced an emergency drill showing the children how to __________ find their “safe place”