用-ing形式的被动语态合并句子

I had taught the boy many times．The boy still didn’t know how to do the exercised．

＝________, the boy still didn’t know how to do the exercises．

用-ing形式的被动语态合并句子

The school have been built for two years．The school is intended for the disabled children．

＝The school, ________, is intended for the disabled children．

Color blind people often find ________(难以区分)between blue and green．(distinguish)

She is busy with applying for a patent recently, and has ________(没时间整理房间)which is in a mess now．(tidy)

In no case ________(允许他)to get up until he was completely recovered from his illness．(allow)

He wished to forget everything ________(与原来生活有联系的)and start a new life．(associate)

A major problem arose at the meeting ________(要花多少钱)to complete the whole project．(cost)

The food must be eaten up within three days ________(一旦打开)．(open)

You'd better call him up ________(万一他记不清)the exact time．(remember)

Come to my office tomorrow if ________(你方便的话)．(convenient)