_______ fun it is to have a field trip on the Orange Island!（　　）

A．WhatB．What aC．How

Keep trying， ______ you might surprisingly find hidden abilities within you．（　　）

A．butB．andC．or

Yesterday our headmaster made a speech ______ environmental protection， and we learned something about recycling of waste．（　　）

A．onB．atC．to

I can't find Sarah． Where is she？

She ______ for tomorrow's Xingcheng Cup speaking competition at home．（　　）

A．preparesB．will prepare

C．is preparing

So sorry， I took your school T﹣shirt by mistake． But where is _______？

Don't worry． Let me help you find it．（　　）

A．yoursB．hisC．mine