用they used to keep pets.否定,疑问各造两句话,翻译

用they used to keep pets.否定,疑问各造两句话,翻译 to,also,fire,keep,they,their,safe,used,families 连成完整的句子 They p to keep the enviroument clean.p后面填什么 英语翻译：For a while they'll keep on applying the old pressures that used to work so well. they keep their secrets to themselves为什么用介词“to” They tried to keep this____happening. they do as they used to do They used to go out to eat.( 英语翻译I like dogs.Many people like dogs.Dogs and people are friends.Some dogs also do different linds of work.Dogs are used to keep watch.They tell people when dangeris coming.Some dogs are used to keep people safe.They sre also used to move an The pot _ for _hot water .A used; keeping B was used; keeping C is used; to keep Dused; keep 关于dog的英语作文I like dogs many people like dogs.dogs ang people are friend.some dogs also do different links of work .dog are used to keep watch.they tell people when dangeris coming.som dogs are used to keep people safe they are also used The foreigners __there,but they __the food there at first.A used to live ,didn't be used to B are used to living,didn't used to C used to live,weren't used to D used to living,usedn't to 选C 为什么选C be used to do 怎么用?后一个 空 不理 I used to keep pets(对keep pets划线提问)（）( )did youI used to keep pets(对keep pets划线提问)（）( )did you to have they used to live here等于什么 People used fire to keep warm ang drive a___ animals. they also used fire to give them light and keep them warm in winter.本句中and连接的是什么?keep前是否省略了to?为什么．求详细 They agree to keep the news to ( ) (they) They also help to keep people happpy.