Ⅰ、authorise（动词）授权、批准 authorisation（名词）授权、委任 authoritative（形容词）的、命令式的 authority（名词）权力、职权 authorities（名词）权力、职权
① Dr Li has authorised David to act for him in his absence. ② The Ministry for Finance authorised the payment of annual increments.
③ One needs special authorisation to enter such a building. ④ This news came from an authoritative source， so it must be reliable.
⑤ The Commander-in-chief spoke in an authoritative tone.
⑥ As a senior officer， Jason is entitled to have authority over the clerical staff.
⑦ Who gave you authority to implement the new salary scheme？ ⑧ Dr Wong is an authority on language teaching.
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⑨ The authorities concerned must see to it that the same thing will not recur. 【知识点二】
Ⅱ、clear（形容词）清楚的、明白的、无嫌疑的、债务已清的； （副词）远离的 （动词）清除、解除。
clearance（名词）清除、许可（证） （修饰语）清货
clearing （名词）林中空旷的 clearly（副词）清楚地
① The speaker's voice is clear enough to be heard. ② Can you make your last point clearer？ ③ The suspect was clear of suspicion.
④ The gambler hopes to be clear of debts soon.
⑤ Unauthorised persons are advised to keep clear of the premises. ⑥ The police have cleared the road of obstruction.
⑦ If there exists misunderstanding among friends， please clear it up.
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⑧ Have you seen any slum clearance？
⑨ The plane must get clearance for take-off.
⑩ Before Christmas， shopping centres have the habit of holding annual clearance sales.
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