What letter can be used to test your eyesight?

What letter can be drunk? What letter can be used to test your eyesight? What letter can fly? 英语翻译To whom it may concern,Thank you for your email.It will be very nice if you can prepare a letter in English expressing clearly what the challenges are and what assistance U can provide.Best regards What letter can see things? CAN U BE MY what is pronounced like one letter,written three letters,and can be drink What letter can see things?急 1、What letter can fly?2、What letter can we drink?3、What letter can we eat?4、What letter is a Can u be my girlfriend? 1、What letter can fly?2、What letter can we drink?3、What letter can we eat?4、What letter is a1、What letter can fly?2、What letter can we drink?3、What letter can we eat?4、What letter is a part of the face?5、What letter is a question?6 what letter should appear next?Z X U Q L 1.what letter should next?Z X U Q L Accept what u must, and change what u can.翻译 猜谜语（英语）what letter is a plant?whatletter is a question?what letter is a person?what can be seen twice in a moment,once in a month but never in a year? letter should appear next?what letter should appear next?Z X U Q L 3、why is U the ijlliest letter?4、what letter is an animal?````` what letter is a drink(饮料）例：what letter is you?It's U.还有,What the end of the world?It's_____.Can you end a game(结束） of hide--and--seek with three letter?they're ______.