We are all concerned _______ her safety.
A
beconcernedabout：关心，担心。句意：我们大家都担心着她的安全。
Evenwiththenewdevelopmentinresearch,onlyatiny________ofalltestsaredonewithoutusinganimals.
Weregret______toacceptyourtermsofpaymentandthereforehavetoreturntheordertoyou.
Asactivitycarried________asonethinksfitinone’ssparetime,leisurehasseveralfunctions.
Thisis________goodreadinghabitsarenotonlyanimportantstudyskillforthestudent,butalsoanimportantlifeskillforanyone.