refer、suffer、offer、fever中er的读音哪个与其他三个不同,请指出,并说明,

suffer,offer的过去式r要双写吗?我只知道refer要双写, refer、suffer、offer、fever中er的读音哪个与其他三个不同,请指出,并说明, refer Offer offer Explain the words in English:suffer ['sʌfə] 英语翻译We offer commissions for webmasters who refer visitors to our site.我们提供佣金给.把webmasters who refer visitors to our site.这句翻译了.语句通顺点.分不多. 英语翻译1.Offer of a PlaceThis offer of a place is conditional on you obtaining the necessary Australian Student visa.Please refer to the offer and note any specific conditional attached to this offer.2.Statement of FeesThis document sets out the suffer 意思 suffer是什么意思 suffer造句 suffer the suffer,suffer from怎么区分? suffer,suffer from如何区别? suffer fromI suffer the headache 求英语高手给填几道填空题Fill in the blanks with the proper words and expressions given below,changing the form if necessary.　essential damage to refer to ...as ...release consequencederive phenomenon suffer from convert supply with1.We_ refer to refer to