.It is obvious to the students ______ they should get well prepared for their future.
The manager came over and asked the customer how ___________.
-Are you sure you have to? It’s been very late.-I don’t know ________ I can do it if not now.
Is it the letter you got yesterday ________ makes you so sad?
It’s important to listen to your teacher carefully in class, so try not to let your mind _________.
-Do you mind if I turn off the TV? -__________.