解析：benefit from 受益于......。

　　答案：from

　　Ⅳ.语法填空

　　People __1__ (enjoy) the benefits of cycling in Amsterdam for years. It is a good city for cycling because it is flat and therefore is __2__ (convenience) for bikes. There are also plenty __3__ places for bicycle parking and most streets have a bicyle path.

　　In the 1960s, a group of cycling fans had an idea. They believed that it would be better for everybody if cars weren't allowed in the city centre. They were __4__ (hope) that this would help to save energy, reduce __5__ (pullute) and provide free public transport. The group painted hundreds of bicycles white and placed them in lots of neighbourhoods around Amsterdam for people to use. Anyone was allowed __6__ (use) them for short journeys. __7__ someone finished a journey, they would leave the bike there for someone else to use. The problem was __8__ it didn't work-thieves took all the bikes within weeks. __9__， more than thirty years later, the "white bike" is back in town. The new"white bike"is not __10__ (actual) white but is an unusual design with bright colours.

　　答案与解析

　　1．have been enjoying　for years 与现在完成进行时连用。

　　2．convenient　形容词作表语。

　　3．of　plenty of 充足的。

　　4．hopeful　形容词作表语。

　　5．pollution　名词作宾语。

　　6．to use　be allowed to do sth. 被允许做某事。

7．Wherever　wherever 引导让步状语从句，意为"无论