单选题 Students are asked to arrange these important events in historical ______.

单选题 ______ I have to experience great difficulties, I will never give up my dream of being an excellent athlete.

单选题 We celebrated our 20th wedding ______ in the Maldives last month.

单选题 Copernicus (哥白尼) ______ people that the Earth ______ round the Sun in the 16th century.

单选题 The first time I ______ Betty, she ______ the piano with great concentration.

单选题 Those who work toward goals with persistence ______ the rewards.

单选题 Mary painted a happy boy with a book in one hand and a big ______ on his face.

单选题 Although I am a new driver, I have ______ in my driving skills.

单选题 The volunteers are ______ the materials needed for the meeting at the entrance of the hall.