The volunteers try to convince people _____the fact that some species are in danger of _____.

The manager of the company told us thatvery little _________ was made of the waste material in the past.

下列各句中，没有语病的一句是 （ ）

Only by shouting at the top of his voice, ___.

It’s so wet there that the trees are extremely tall, some ______ over 90 meters.