—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
Jack decided to buy himself an iPhone 4 _______ it means standing in line all night waiting.
I didn’t go outing on National Day because the bad weather ______ the difficulty.
As is known to all language learners, the newly learnt words will soon be forgotten unless______ used in everyday communication.
Was it because of the bad weather _____ the sports meeting had to be put off till next Friday?
More and more people have got to know the importance of the English study. ______, about six people in ten in this city are able to speak a little English.