Let a,b and c are rtional numbers which satisfy a-7b+8c=4 and 8a+4b-c=7.Then a^2-b^2+c^2=?

Let Ben and Tom ( )good friends.A is B are C be D will be ( )Let john and jack______our friends.A.be B.to be C.are D.is Let you and _____good friends.A.I am B.me be C.me are D.I are(选择 Let _____ help you ,Mr.Hu A.Lucy and me B.I and Lucy C.me and Lucy D.Lucy and I( )Let _____ help you ,Mr.HuA.Lucy and me B.I and Lucy C.me and Lucy D.Lucy and I( )____ are middle school students.A.They,we and you B.We ,you and they C.You ,we and they Let is ( )pen friends.A:be B:are C:is there are few ___in the fridge .let's go and bu some peas and carrots and cabbage.a:vegetables B:fruit C:meat D:eggs Let a,b and c are rtional numbers which satisfy a-7b+8c=4 and 8a+4b-c=7.Then a^2-b^2+c^2=? Tom,Let,s play__that ball.A.with B./ C.and Let you and_____good friends.And let_____help you.A.my are;I B.I am;I C.me be;me d.I are;me(选择并说明） let you and ( )friends.A I am B I are Cme are D me be There are few ____ in the fridge.Let's go and buy some pears,carrots and cabbages.A vegetables B fruit C meat D flowers There are few ________ in the fridge．Let’s go and buy some peas, carrots and cabbages．A. vegetables B. fruit C. meat D. eggs there are only _ oranges at home .Lets go and buy some.A.few B.little C.a little D.a few必须详细说为什么 1.（ ）fathes are at my birthday party.A.Tom and Paul's B.Tom's and Paul C.Tom's and Paul's2.Let ( ）have a look at ( ) photoA.she,he B.her,him C.her,his Some chicken and a bottle of beer for me,please.(回答）回答：A.Here you are B.Good idea C.Let me see Let you and___friends.A,I am B,I are C,me are D,me be Let us ____good friends and always help each other.A.to be B.are C.be D.get回答写理由快 Thet are playing under the tree.Let's go and ____ them.A.join in B.take part in C.join D.joining请说明为什么!感激不尽!