Thebackgardenofourhousecontainsalawn，____verypleasanttositoninsummer.
A、whichisA
「句意」 我家的后花園有一片草坪，夏天坐在上面會令你心曠神怡。
「難點」 which 引出非限制性定語從句，在句中作主語，且和sit on 構成動賓關系。類似的句子有：This room is comfortable to live in 這句中 live in 和 this room 構成動賓關系。
Marytiptoedoverandtooktheclockawaybecauseshehatedtohearit___whenshewastryingtogotosleep.
At______,photographyisachemicalprocess,duringwhichalight-sensitivematerialisalteredwhenexposedtolight.
Ofcourse，（）mostimmigrantsdidnotgetrichovernight，buttheofthemwereeventuallyabletoimproveupontheirformerstandardofliving.
Idon’tlike_____billsbutwhenIdogetthemIlike_____thempromptly.
Itisnotuncommonforthere_____problemsofcommunicationbetweentheoldandtheyoung.
