Jay Chou is _______ that teenagers are all crazy about him

It is known that the weight of an object________ from place to place on the earth.

We’ll visit the Summer Palace_______ there is aheavy rain tomorrow.— OK! Boating on the lake must be great fun.

My brother is good at math. ______ often helps me with my math study.

Haven’t you finished your application form online—Yes. My classmates and I _____ on it for the whole afternoon.