When _______ your computer ___________? —Yesterday afternoon.

They want to develop a kind of dog-friendly food _____ will help dog owners cool down their pets. [ ]

Li Mei is the student _________ handwriting is the best in our class.

How far is it from the railway station to the hotel?–It’s about _______ walk.

did your sister work in that hospital?—For two years,then she moved to the south.[ ]