【简答题】Most animals know how to relax and they know the importance of______ (relax) to their survival.
【单选题】--Are you often on vacation? -- Not always.
【单选题】That could be enough to ______Greenspan to relax.
【单选题】We are tired. Let's __ . [ ]
【单选题】People are really ______________ on the beach in summer (夏季).