【推荐1】Among the crises that face humans ________ (be) the lack of natural resources. (所给词的适当形式填空)

【推荐2】Seeing __________ (be) believing. (所给词的适当形式填空)

【推荐3】Talking loud in the reading room_________(be)considered impolite.

【推荐1】As summer __________ （approach）， it's time to have an enjoyable visit to the colourful nature. （用单词适当形式填空）

【推荐2】The pollution is ___________ (endanger) the crops.(所给词的适当形式填空)

【推荐3】________ (join) us in the studio tonight are James Smith, a local resident: Vincent Brown, senior manager of a local factory, and Julie Archer, chief of the Norgate Environmental Protection Committee. （所给词的适当形式填空）

【推荐2】The term “cardboard city” ________ (coin) to describe communities of homeless people living in cardboard boxes. (所给词的适当形式填空)

【推荐3】He ______ (regard) as an important figure in history.