Jack wasn’t saying anything,but the teacher smiled at him________he had done something very clever.
To their great relief, the lost child went back home, ______, after an absence of two weeks.
-----Have our working conditions improved? ---No, ______than before, I’m afraid.
The task is too much for him, so he can’t continue ______any longer. He must get some help.
I haven’t seen______ this since I collected stamps.
I am afraid that his answer is _____ from correct.