_____ three influenza type A virus subtypes(子类型) have been found in pigs.
The internet has made ____ possible for everyone to talk with friends miles away.
My mind wasn't on what he was saying so I'm afraid I ______ half of it.
--- Can you believe I had to pay 50 yuan for a haircut? -----You should try the barber’sI go. It’s only 10.
One of our rules is that every teacherwear school uniform while attending the school flag-rising ceremony.
Deaf people can't _____,but they can learn how to move their mouths ______they can speak.