My son is _____ to be seen. Where has he gone — I think he _____ in the building.

Six persons, _____ , died in the battle

下列各句中,没有语病的一句是

I hear a number of workers in the factory_____out of work.__Yes, and the number _____quite huge.

We are said to be living in ________ Information Age,_______ time of new discoveries and great changes.