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

____ with the size of the whole earth, the highest mountain doesn’t seem high at all.

How was your recent visit to Qingdao?　 —It was great We visited some friends, and spent the days at the ________ seaside

The machine is easy to _______if you follow theinstructions.

Have you ever checked homework– Yes, is well done.