根据句意，用括号中所给词的适当形式填空。并将答案写在答题卷相应位置上。
小题1:He always makes me ________ when I am sad. (laugh)
小题2:Some from the USA went to visit Yunnan History Museum. (tour)
小题3:The sea is big on the earth , but the sky is than the sea.(big)
小题4:Maybe I can’t go swimming with you. I have a . I have to see a dentist. (tooth)
小题5:The number of the students in our school 3000 this year. (be)
