The eastern bluebird is considered the most attractive bird native of North America by many bird-watchers.

(A) Bluebird

(B) Considered

(C) Native of

(D) By

_________so much, the doll is still on the shelf.

A. Cost B. Costs C. To cost D. Costing

_________you to the job, he felt calm.

A. Appointed B. Appoint C. Having appointed D. To appoint

It is difficult to write rules that tell exactly when we should apologize , and it is not difficult to learn how to do it 

(A) Difficult

(B) That

(C) When

(D) And

The clerks who are happy to wait for their customer will get promoted soon.

(A) Clerks

(B) Wait for

(C) Customer

(D) Get promoted

Practicing his speaking English everyday, his hope was to get a good job in a foreign company.

(A) His

(B) Everyday

(C) His hope

(D) To get

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