Which is the antonym of “block”? A: Clear B: Intercept C: Interdict D: Obstruct

Being more prompt and reliable, e-mails have _____(替代) for hand-written letters today. A: constituted B: resisted C: substituted D: obstruct

The low operating costs of the foreign company will （） the high labor costs the business pays in its own country. A: offend B: obstruct C: oblige D: offset