It be the vocabulary that caused you the problem in the exercise because you know a lot of words.
We’ve offered her the job, but I don’t know ___ she’ll accept it.
—Look at these clouds!—Don’t worry.___ it rains; we’ll still have a great time.
Sales director is a position ___communication ability is just as important as sales skills.
I woke up with ________ bad headache, yet by ________ evening the pain had gone.
My car broke off. I want to call my friend for help.