According to the report, an Iranian nuclear scientist was killed and two people were injured when a bomb ______ to a car exploded in its capital city.
I don’t doubt _____ he is a brilliant scientist, but can he teach?
Criticism and self-criticism is necessary _____ it helps us to correct our mistakes.
_____ or not we had a baby, we couldn’t survive only on my salary.
_____ you are familiar with the author’s ideas, try reading all the sections as quickly as you possibly can.
_____ he works hard, I don’t mind when he finishes the experiment.