看图，将单词补充完整
sevent_ _n
看图，完成对话
--How many keys can you see?
--I can see _________.
填空
The next number to eighteen is _______.
The next number to twelve is _______.
--Is it a radio?
--Yes, it ____.
--No, it ____.
--______, it is.
r_dio
c_mputer
c_mera
