语法填空。
(1). By the 1850s, the book was selling one million copies a year, ______ (make) it one of the most popular ever.
(2). This non-stop communication has made ______ easier for them to understand each other.
(3). It doesn’t make much of a difference ______ a teacher speaks British or American English.
(4). The T-shirts are available in wide ______ (vary) of colors.
(5). The art show was far ______ being a failure; it was a great success.
(6). The morning is ______ we are busiest.
(7). We must create an atmosphere ______ we can concentrate on our lessons.
(8). Up to now, this program ______ (save) thousands of children who would otherwise have died.
(9). ______ (person), I don’t like him at all.
(10). Give him an inch, ______ he will take a mile.