As long as the whole of our society _____ trying， we will make our skies blue again． （ ）
A．keepsB．will keepC．kept
﹣ Thanks a lot for taking care of my boy when I was away.
﹣ _________.We had great fun together.（ ）
A．All the bestB．Good idea
C．That's rightD．Don't mention it
China's Tianwen I Rover landed on Mars on May 15th.2021.Do you know _______？（ ）
A．what it was going to discover
B．why was it sent there
C．what it looks like
D．how many photos does it take there
﹣ My family will go on a trip to Beijing this summer.But we haven't decided _________.
﹣ Why not take the high﹣speed railway!（ ）
A．when to leave
B．how to get there
C．which hotel to choose
D．how long to stay there
My cousin is creative enough to _________ the new challenging task.（ ）
A．take onB．take outC．put upD．put in
Little Simba went hunting alone.The Lion King walked around，_________ his safety.（ ）
A．with the help ofB．in fear of
C．at the speed ofD．on top of