Would you like to go _____ a picnic.—Yes, I’d love to.[ ]

This is ______ my pen. I’m writing with _____ pen.

. Rather than _______ on a crowded bus, I always prefer _____ an electric bicycle.

How are you going to the Summer Palace?—We’re going therebike. [ ]

How nice your watch is! How much did you ________ for it?—120 yuan.