—How many students are there in the classroom?—_____ I don’t know where they have gone.
I will visit my aunt ____I am free tomorrow. A if B whether C when D after
Do you know____?
My sister is only five, but she always tells me ____ my pictures are good or not.
Mum, I’m afraid I can’t _____ them in the match.
The police warned us ______ possible danger.