With the development of the Internet, _______ communication is done by regular mail.
Could you ___the radio a little? It’s too noisy.
Once ___, it can never be forgotten.
--Has he passed the exam yet? ---No,He ___ it if he had studied harder.
The little girl ___ out in the dark at night.
Since nobody is here, the meeting will be delayed until tomorrow. The underlined word means ___.