— Will Helen come to meet us today ?— She’s not very busy these days, so she ____come today.
Some of my friends are interested in science, but none of them can tell ________.
______ your English teacher ______ you ?
They were talking about the persons and things _______ they saw in the factory.
Not only the students but also their teacher_______ the Great Wall before.
It is impossible for ______ little children to do ______ much work within 20 minutes.