_______to improve the students’sight, the eye exercises are done in schools nationwide.
—Peter, you take down the result of the experiment, ? —Oh, no problem, but I need to find my pen and notebook first.
To be honest, I wonder why you are so late. —Sorry, I ___ that you were waiting for me.
It is very important for us to employ a word or a phrase according to the in language learning.
It was not until dark ___ he was aware of ___ he thought was the correct way to solve the problem.
We expected their house to be very large, but it is ___than ours.