our hometown is only a small one the number of foreigners living and working here is grow

问题补充：

our hometown is only a small one, the number of foreigners living and working here is growing fast.

A. Because

B. Although

C. Since

D. If

答案：

A. Because

(答案→)B. Although

C. Since

D. If

解析：词义辨析。Because因为；Although尽管；Since自从，因为；If是否，如果。句意：尽管我们家乡很小，但是在这生活和工作的外国人增长很快。所以选B。