It is difficult to judge whether what he said_________.

He is going to study hard at math. He wants to be ________ engineer.

Dear, what about going to the beaches for vacation? —Great! _______we’re lying on the beach in the sun, enjoying music. It must be great fun!

Welcome_____ the Great Wall. [ ]

That is the man _____ saved ten children in the earthquake. —How brave he is![ ]