............... photosynthesis were to stop, life would disappear from the planet Earth relatively quickly.
A. For
B. However
C. If
D. Although

Experiments in the sonic imaging of moving objects ............... in both the United States and Europe well before the Second World War. 
A. were conducting
B. have been conducted
C. had been conducted
D. being conducted

 Physicians can look into the lungs, heart and other areas that were formerly ............... to them.
A. accessible
B. access
C. accessibly
D. inaccessible

 ( gạch chân dươi ch )
A. ache
B. chemist
C. cheerful
D. scholarship

( gạch chân dưới h )
A. hour
B. hear
C. hit
D. hat

 ( gạch chân dưới ou )
A. enough
B. rough
C. tough
D. though

Question 2 (gạch chân dưới ea )
A. clear
B. ear
C. heard
D. near

Question 1 (gạch chân dưới ch )
A. chorus
B. Christian
C. cholesterol
D. check

 Yes, I agree, but at the same time it’s not (the end of the world.) => tìm từ cùng nghĩa với cụm trong ngoặc
A. worth worrying about
B. worth talking about
C. worth looking at
D. worth speaking about.
-

“ I am very much obliged to you for helping my family.” - “________ ”
A. My pleasure.
B. That’s all right
C. You’re welcome
D. A & C are correct