Henry was ill,so I________go there by myself.
______ great scientist Qian Xuesen is!
I don’t know when he ______. When he ______, I will let you know.
------Whose shirt is this? ------ It _______ be Li Lei’s. It is too big for him.
Stop smoking, _______ you will get better soon.
—How long have you _______________ the motorbike? —For about two weeks.