— What are you going to do this weekend?— I’m not sure ______. Maybe I am going swimming.
---Mum, where did you put my sweater?---Is it _____ black one? I put it in _____orange box near your desk.
---Why didn’t you enjoy the talk?---It was __ _talk that I had ever listened to.
Frank often wears a mask _____ he can keep fit in the foggy and hazy (霾) weather.
They said they would have ____________ holiday.
We all want to try something new, but finding the _________ to start is always the hardest part.