I don’t know if he ________ back tomorrow. If he ______ back, I’ll let you know.A. comes; will come B. will come; came C. will come; comes
---- My mother is ill in hospital? ---- _________.
---- Do you know Jack well? ---- Certainly, we _________ friends since ten years ago.
The box is too heavy for me _________.
It _________ rain this afternoon, but I am not sure.
_________ the help of man-made satellites, we can know what the weather will be like in the next few days.