The more ______ we take the safety standards, the further we can speed up the development of the school bus industry.

I called ________ his house this morning,but he wasn’t in. So I left a message telling him I would call______ him thenext day.

The sudden illness______her blind，deaf and speechless.

Hundreds of species are declared to _____ in the coming century.

ustbeamistake　—No,it_____amistake