请教几道语法题，请多多指教！

sywen

After the Boston Tea party in 1773,coffeehouses is the North American colonies became centers for gossip, gamble, and political criticism.

gamble 是不是应该加s变成复数？

Pure iron cannot be hardened by heating and cooling ,as ＿＿＿＿,because iron lacks the necessary carbon.

A. steel it can     B can steel    C with steel  can  D so can steel

为什么选B?

A patrilineal extended family consists of core group of males,their wives,and their unmarried daughters.

为什么选extended ？

Petrography concerns primarily with the detailed description and classification of rocks ,whereas petrology deals primarily with rock formation .

Formation 是可数名词吗？为什么选择concerns?

gre3333

为方便查找，请楼主修改一下发贴格式，参考这里：

【发贴必读】----《语法区版规》提问格式说明★

此外，建议一题一贴，方便回答。

criz

1 个人认为选D 改名词

2 B 个人认为can是名词 “罐装”来修饰后面的名词

3 改为副词

4 困惑啊

pamela111

gamble这道题有人问过了，应该是gambling。

concern的用法是：

1.及物动词,A concerns B.（这道题后面不是还有with，所以concern错了。）

2.A is concerned with B.所以正确答案应该是be concerned。

wonly

can steel    应该是比较级的倒装形式吧。

例如：I like money as   you do( or do you)