---Is Johnson on duty today?---It ________ be him, but I’m not sure.
The weather turned fine , _______ made us very happy.
-_______do you spare time to visit your parents every month? -Twice.
No one knows who the cars damaged in the flood _______.
Tere are a few books on the shelf. But only one of them is _______
I know my English cannot compete ______his.