— What's the last line of the poem Song of the Great Wind?
— It's Where can I find brave men, oh! To ________ (守卫) my four frontiers today!
Einstein was forced to move to the USA in 1933 because of World War II and later became a ________ (德国的) American.
This tourist took lots of amazing close-up ________ (照片) of some of the world's most dangerous animals in a very special way.
Our school basketball team may lose the competition ________ (除非) all the players work hard together.
COVID-19 has made people think harder about their ________ (关系) with nature. It has also raised questions about lifestyles.
Be careful not to ________(触摸) the paintings in the museum.
