I will perform _______ the piano in the concert to be held tonight.
—Which one of these T—shirts do you want? —______,Either will be OK.
The first thing ______ I am going to do this evening is to go to sleep.
Mother’s Day is coming, I’m thinking about ________
__________ good advice the teacher gave me!
The traffic was busy on our way to the train station, _____ we caught the train on time at last.