It’s really unwise of some teenagers from low-income families to spend a large sum of money on Apple products ______ they could buy other cheaper brands.
-- Can those _______at the back of the classroom hear me? -- No problem.
Your story is perfect; I've never heard _______ before.
They have already_______ themselves for the travel.
When you meet new words while reading, you can _______your dictionary.
If your baby has a fever, you should take him to see a doctor_______.