Unit5 Topic2 SectionC 随堂练习 一、 用所给单词的适当形式填空 1. —Look! Kangkang is here. —Yes, he ______ ______ (draw) pictures. 2. Look! Some students ______ ______ ______ (have, lesson) in the classroom now. 3. —______you ______ (sit) in the lab? — Yes, I am. 4. —Do you often ______ ______ ______ ( 写信) your friend? — No , sometimes. 5. —Where is Sally? — She is cleaning the blackboard ______ ______ ______ ______ ( 在......的后面) the classroom.