An e-mail address consists _______letters and dots and the symbol‘@’.

He has _________ friends here because he is always friendly.

—There _______ a factory here, but now it has changed into a big supermarket.— You are so lucky to live here.

— _______  do you use the Internet ?    —Twice a week. 

The model plane isn’t as nice as my partner’s, but        it was made by myself.