2道the little boy was so nervous that he didn't know ____

2道
the little boy was so nervous that he didn't know ____ .A how he could do it .B what he could do it .C how could he do it. D what could do it
Middle school students don't know much about shopping online ______they?----______.It's very popular with teenagers.A do;NO B do ;yes C don't ; No D don't ; Yes