— Sorry, Mum. I'll at once.
A:put them up
B:put them on
C:put them away
D:put them down
①abc>0;②b2<4ac;③4a﹣2b+c>0;④2a+b>c.
He doesn't have much time ____ (listen) to music from Monday to Friday.
若|a+5|+(b﹣4)2=0,则(a+b)2016=____.