He the litter on the ground and threw it into the bin．

We are in _______.

They ______ on the program for almost one week before I joined them, and now we _____on it as no good results have come out so far

My sister ______ go to bed _______ my mother came back last night.

When and where shall we meet tomorrow—Let’s _______ it 3:00 p. m. at my home.