Please keep us ________ of how things are going on.
34. -Are you sure you have to? It’s been very late. -I don’t know ________ I can do it if not now.
33. Is it the letter you got yesterday ________ makes you so sad?
32. It’s important to listen to your teacher carefully in class, so try not to let your mind _________.
31. -Do you mind if I turn off the TV? -__________.
30. Jennifer, who is my best friend, said she would go abroad for further education __________.