One of our rules is that every student          wear school uniform while at school.

The children _____lost in the woods; otherwise, they would have been at the lakeside camp as scheduled. 

—_______ I borrow your English book?—Yes, of course you _______. 

 —Is the woman over there Miss White? —It ______ be her. She’s gone to Hangzhou.

Facts prove that the world’s economic development is not a win-lose game but one in which all ______ be   winners.