A．It is first offered as part of the edX learning programme.
B．It is another free MIT-Harvard online learning programme.
C．It is a standard to recognise online learners' achievement.
D．It is a new kind of free online course of Harvard and MIT.
A．It feels sick.
B．It feels upset.
C．It feels sleepy.
D．It feels hungry.
A．He is strict.
B．He is unkind.
C．He has the wrong idea.
D．He sets a timetable for mothers.