A:learning
B:are learning
C:to lear
D:lear
-5+(-9)=____
It's so dark and cold outside. You'd better _______ now.
1936年,第11届奥运会首次通过电视实况转播,共有16.2亿万观众。1996年,第26届奥运会电视实况转播累计观众196亿人次,这说明( )