The big problem was that we really did not understand what was happened

(A) Problem

(B) That

(C) Did not

(D) Was happened

A beaver uses its strong front_teeth to cut down trees and peel_off its bark.

(A) Its

(B) Front teeth

(C) Peel off

(D) Its

There was a gradual raise in the number of literate males and females in the lowlands.

(A) A gradual

(B) Raise

(C) Literate

(D) The lowlands

The Red Cross organizes and leads relief assistance missions after natural disasters such as floods, tsunamis, earthquakes, and homelessness.

(A) The Red Cross

(B) organizes and leads

(C) assistance missions

(D) and homelessness

More Asian students than American counterparts agree that a husband is obliged tell his wife where he has been if he comes home late.

(A) Than

(B) Counterparts

(C) Tell

(D) Has been

Today, although their status varies from country to country, women in most parts of the world have gained  significance legal rights.

(A) Although

(B) Most parts

(C) Gained

(D) Significance

ON the wedding day, the GROOM'S family and relatives GO to the bride’s house BRING gifts wrapped in red papers. 

(A) On

(B) Groom’s

(C) Go

(D) Bring

The developing of the submarine was hindered by the lack of a power source that could propel an underwater vessel

(A) Developing

(B) The

(C) A power

(D) Could propel

Species like snakes, lizards, coyotes, squirrels, and jack rabbits seems to exist quite happily in the desert. 

(A) Like

(B) Seems to

(C) Quite happily

(D) The

Ours brains are incredibly agile machines, and it's hard to think of anything they do more efficient than recognize face. 

(A) Are

(B) Anything

(C) Efficient

(D) Recognize