33．— You seem to be familiar with this city! — I ______ English in a school here for two years．It’s great to be back again!

There ________ an important meeting tomorrow afternoon.

___ is the most useful invention?

William found it increasingly difficult to read, for his eye- sight was beginning to ____.[ ]

Seventypercentofthestudentsinourschool_____fromthecountryside.