—What ______ when the earthquake happened on May 12th ?—Er, I was having a geography class in the classroom. A. are you doing B. did you do C. were you doing D will you do
The maths teacher demanded that all the students _______ the examination paper within one and a half hours.
You must keep it _______ in mind that education is the first productivity.
This word is wrongly spelt;a letter is _______.
It makes _______ big difference to keep calm when giving _______ first aid.
_______, the experiment will be successful.