Where is my pen–Oh, sorry, I have taken yours ____mistake.

I’m going to give a talk on the Dragon Boat Festival to the exchange students.—Great! But don’t forget to tell them______.

__ for two days, Jessica managed to finish her project ahead of time.

When shall we go to the Xuanwu Lake Park， this Saturday or Sunday—________ is OK. I’m free on the weekend.

How much did the salesmen ________ for this machine?- Almost four hundred dollars. [ ]