_________ –Yes, W-A-T-C-H, watch.

Mum, I’ve finished my work.—Good, and ________ you choose to play on your PSP or listen to music on your iPod, you mustn’t disturb me.

I’m sorry I didn’t phone you，but I’ve been very busy_____ the pastcouple of weeks．

下面四个话语情境中，加点词语使用得体的一项是（ ）

Is this Mr White’s office, Mary?— Yes, _____