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At (A), we need a verb in its past participle form due to the use of 'have'. 'Wagged' is the only one available and as per its meaning, it is suited to be used at (A). Wag (verb) - Move (an upwards-pointing finger) from side to side to signify disapproval. 'Themselves' is the right word to be used at (D), to refer to the US and the UK. Option D is the right answer.
Petroleum is a mixture of-
The scientific name of vitamin B12is :
What is the atomic number of silicon, a component of quartz?
The term Fire Ice is used for ___?
Ultra-purification of metals is achieved using:
Chloroquine is classified under which category of drugs?
Hydrogen was discovered by?
An element has an atomic number of 17 and a mass number of 36. How many neutrons are in its nucleus?
What is the Chemical name of Chromic Acid?
What is the chemical name of quick lime?