选择正确的单词完成句子。 【小题1】The girl goes to school ______ (by, on) foot. 【小题2】They are going to travel ______ (by, on) plane. 【小题3】We can eat lots of fresh vegetables ______ (in, at) summer. 【小题4】I have no class ______ (at, in) the weekend. 【小题5】I will visit my grandmother ______ (on, at) Saturday morning. 【小题6】My mother will drive ______ (to, at) work.