–Is there an express to Beijing tonight? -- There ______be , but you’d better call the booking office to make sure.’

 One of our rules is that every student ________ wear school uniform while at school.(2012·辽宁)

—Who is speaking there? —It        be Uncle Li. He has gone to Shanghai.

Life is unpredictable; even the poorest __become the richest.

Some people          feel sick when they read a book in a car or on a boat．