Jack wasn't saying anything but the teacher smiled at him ____ he had done something very clever. A as if B in case C while D though
----- Could I use your electric dictionary? ----- Yes._______.
My father is usually on _______ duty in his office every _______ few days.
It is none of your business ______ other people think about you.Believe yourself.
---Come on, please give me some ideas about the project. --- Sorry.With so much work ______ my mind, I almost break down.
With the good care taken by doctors and nurses, many patients are beginning to _________.