She will call you if she ____.A. goes to B. come back C. comes back
It’s ____ difficult problem for the twins that ____ of them can work it out .
It was very cold the day before yesterday._______
____ unusual news! All of us are surprised at it .
–Where does the man come from? --I don’t know for certain. Judging by her _________, she may be a Southerner, I guess.
As we know, Britain is _______ English-speaking country as well as __________ European country.