The headmaster is so wise that we believe he will lead the school to _____ future.
A：the better
B：a better
C：the best
D：a best
复数i-21+2i=（ ）
读一读，在每句话的括号里填上一对反义词。
①他能绕着地球转圈圈，它在太空中____和____人造地球卫星。
②不论是____还是____，小明都没中断锻炼。
