The flu is believed __________ by viruses that like to reproduce in the cells inside the human nose and throat.
The Chinese government has made the Mid-Autumn Festival a legal holiday,____ people will have a day off.
— Father, you promised!—Well,____.But it was you who didn't keep your word first.
—Oh, we have finished our task and can have a good rest.—________.Our manager took another order yesterday.
I must be getting fat —I can____do my trousers up.
If you are feeling so tired, perhaps a little sleep would____.