-Why is you rprofessor so happy recently?-Because the throry she insisted on__________correct.A is proved B proving C was proved D has proved
Look! There are lots of ________ birds flying over the trees.
--Can you finish the writing on time? --_________.
—Id like a pen which _________ well. —Will this one _________?
It was not until liberation that _________ to his hometown.
—Why not go out for a walk before breakfast? —Oh,yes. _________ is my favorite time of day.