1. I don't know where she is, she _______ be in Wuhan. 2. At this moment, our teacher ___________________ our exam papers. 这时，我们老师想必在批改试卷。 3. The road is wet. It ____________________ last night. (rain) 4. Your mother __________________________ for you. 　你妈妈一定正在找你。

may

must be marking

must have rained

must be looking