You look so curious (好奇) about Beijing .Is this the first time that you _____ here ?
The child tiptoed quietly to the bird. ___ into the forest when he was about to catch it.
Not until I went through his paper ___ what rapid progress he had made in writing.
In front of the classroom___
___sign the contract unless you are sure you understand it.
Eyewitness provides an evidence that he was ___ of the crime.