The idioms list in Manhattan sentence correction guide is an excellent collection.

I believe "worried about" is correct but "worried over" is wrong idiomatic usage.

Such kind of questions, though time taking, are easy as they will have many grammatical issues. For this question, 1. "ability" is singular and cannot take a plural verb. Hence, "have" cannot be present in the verb. This eliminates A and E. 2. "like" cannot be followed ...

From the given information,
m = 6k + 2
n = 6l + 3

m-n = 6(k-l) - 1
= 6(k-l-1) + 5

As m is greater than n, m will be at least 5 greater than n. Hence, "k-l-1" will be positive.

Therefore, the remainder will be 5, which is (E).

A. wild animals have less total fat than do livestock fed on grain and more of a kind of fat they think is B. wild animals have less total fat than livestock fed on grain and more of a kind of fat thought to be --> incorrect comparison C. wild animals have less total fat than that of livestock fed o...

One in fifty

Q. The John Hopkins Center for Gun Policy and Research revealed that half of all American men keep a gun in the house, and that on any given day, one out of every fifty adults carry a handgun away from home. A. one out of every fifty adults carry B. every one out of fifty adults carry C. out of ever...