China made its firm ____ to cut carbon emissions in 2009.
35. The manager came over and asked the customer how ___________.
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? -__________.