It is so cold in Antarctic that the penguins have to stand _______to each other to keep warm.

Just like a voyage at sea, our life journey, ______ time is limited, is full of difficulties as well as opportunities

Statistics show that shanghai subway lines will reach 350 kms by the end of this year, making the city No3 in the world subway length

Sometimes proper solutions are not far to seek ______ food safety problem[ ]

n use a large plastics bottle, _________ cut off, as a plot to growflowers in