Qinghai-Tibet Railway(青藏铁路) was completed last year. It is the __________ railway that connects Tibet with the other parts of China.

. Who would you rather with you, Tom or Henry?

Food safety is important. Rules _____ to stop people from food pollution.

What are you looking for? —I’m looking for the book _____ I bought yesterday.[ ]

What do you usually do _____ weekdays after school? —I usually play football. [ ]