He is at least as tall as his brother, if not_______ .
I want to ring him___to know the reason why he rang___while I was speaking yesterday.
—— ______ shall we have to go? —— Another five miles.
The overcoat made ____ your measure also fits me.
The nice girl always dresses herself __ a splendid dress.
Some of the students are not sure ___ spelling the word, while others are not sure ___ the use of some grammatical rules.