—I think Mr Zhang may be in his office. —No, he be there. I saw him just now.
---- 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.