It is through years of research ________ scientists have discovered the relationship between social media addiction and depression.
A. that B. before
C. since D. when
—Are you free now? I have something important to tell you.
—OK, ________ you make it short. I will have to finish this report before noon.
A. now that B. as soon as
C. every time D. as long as
I owe my current success to David, my best friend since childhood, without whom I have no idea where I ________ today.
A. am B. was
C. would have been D. would be
________ and open to various interpretations, the terms of the new proposal need improving based on the interests of both sides.
A. Accessible B. Apparent
C. Ambiguous D. Aggressive
The ordinary people all look at the intelligent man with admiration because under no circumstances ________ to cope with emergencies.
A. he will fail B. is he failing
C. he is failing D. will he fail
________ well for my job interview, I really had butterflies in my stomach on my way to the company I had applied to.
A. Having not prepared B. Not having prepared
C. Not to have prepared D. To have not prepared
