Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to the following question.
________ research team is an effective way to prepare for class preparation of social studies such as history, geography, literature and economics.
A.Form
B.Forming
C.Forms
D.Formed

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
I clearly remember ________ you about this before.
A.telling
B.tell
C.to tell
D.being told

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Please accept my apology. I didn’t mean ______ your birthday party last night.
A.to have missed
B.being missed
C.having missed
D.to be missed

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Mrs. Wilkinson is very helpful in ______ books in the library that encompass the period of the Renaissance
A.will locate
B.located
C.to locate
D.locating

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to the following question.
Jenny is an early riser and she doesn’t object___________the trip before 7 a.m.
A.against starting
B.to start
C.to starting
D.to have to start

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
My father continued _______ although the doctor advised him _______ the habit several times.
A.to smoke/ quit
B.smoking/ to quit
C.smoke/ quitting
D.for smoking/ of quitting

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
It’s no use _______ a language if you don’t try to speak it too
A.learn
B.learning
C.learned
D.to learn

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
It costs me a fortune, but I don’t regret_______ a year travelling around the world.
A.have spent
B.to spend
C.spent
D.spending

Phản ứng nào sau đây là phản ứng nhiệt nhôm?
A. $ 2\text{A}l+2NaOH+2{{H}_{2}}O\to 2NaAl{{O}_{2}}+3{{H}_{2}}. $
B. $ 2\text{A}l+3{{H}_{2}}S{{O}_{4}}\to A{{l}_{2}}{{(S{{O}_{4}})}_{3}}+3{{H}_{2}}. $
C. $ 3F\text{e}O+2\text{A}l\xrightarrow{{{t}^{o}}}3F\text{e}+A{{l}_{2}}{{O}_{3}}. $
D. $ 2\text{A}l+3CuS{{O}_{4}}\to A{{l}_{2}}{{(S{{O}_{4}})}_{3}}+3Cu. $

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to the following question.
Nowadays a large number of young people spend much time_________the Internet.
A.surfing
B.surfed
C.to surfing
D.to surf