你想表达他很瘦你应该说（）

A.The boy in red shorts is the first

B.The boy on red shorts is the first

C.The boy to red shorts is the first

A.I am from USA

B.I am from the USA

C.I am from the UK

A.My adress is 135 Nine Street

B.My adress is Ninth Street 135

C.My adress is 135 Ninth Street

A.Who's pen is this

B.Whose pen is this

C.Is my pen

A.How are you

B.Where are you from

C.Welcome