The back garden of our house contains a lawn ，____very pleasant to sit on in summer.
A
「句意」我家的后花园有一片草坪，夏天坐在上面会令你心旷神怡。
「难点」which引出非限制性定语从句，在句中作主语，且和siton构成动宾关系。类似的句子有：Thisroomiscomfortabletolivein这句中livein和thisroom构成动宾关系。
The（） in Janet‘s character has hindered her froom advancement in her career.
Ifasubstanceisdissolvedinwaterorheated，itmay（）agas.
Evenifhisletter（）tomorrow，it（）toolatetodoanything.
Whataniceday!Howaboutthethreeofus_____awalkintheparknearby.
Even if his letter（） tomorrow ，it（） too late to do anything.