______ we know, the air quality in the city has improved over the past two years.
A. That B. As C. What D. It
We sometimes have to meet some difficulties, but we should develop a good attitude _______ life.
A. in B. on C. at D. to
_______ never to come back, the boy left his home angrily.
A. Determined B. Determining C. Being determined D. Determine
When my grandfather retired(����) at the age of 60, he took a sea ________ around the world, which had been his dream since his childhood.
A. travel B. trip C. voyage D. journey
--- Look at those clouds! --- Don’t worry. _______ it rains, we’ll still have a great time.
A. As if B. Even if C. As though D. If
The newly-built house, the walls _______ are painted light green, is really a peaceful place for us, especially after hard work.
A. that B. whose C. of whom D. of which
