He formed a good habit from his childhood, ________ a lot of useful knowledge.

I went back to the cinema to look for my keys, only __________. 

While waiting for the opportunity to get    , Henry did his best to perform his duty.

—What do you think made Tina so delighted？ —__________ the driving test at her first attempt.

______from space, the earth with water _______70％ of its surface looks like a “blue blanket”.