per is due next month, and I am working seven days ______ week, often long into______night.

We were delayed at the airport．Otherwise，wehere by lunch．

It has been proved _____ eating vegetables in childhood helps to protect you against serious illnesses in later life. [ ]

Who has opened the door? —I think it __ be Lin Tao. He’s always the first to get here.

It is a great pleasure for a woman to ________ the price while shopping. [ ]