It is ____ greatpitythat the discovery of flight MH 370 still proves to be ____ failure.

What do you think of Tom —He has been working very hard ______ heis an advanced worker

It is important to have your eyes examined regularly tocheck for any sign of eye disease that may not have any ________

They Shanghai two days ago.—Yes. They for two days.

The lectures delivered by excellent teachers across the province _____a fairly wide range about English teaching and I can’t sum them up in a few sentences.[ ]