My little sister is afraid of to stay at home alone.
________ a teacher, I think I should teach the students not only how to learn but also how to be a man.
The young man ________ the beautiful girl when he saw her for the first time.
–There will be more plants and animals. --I _______.We can’t live without them.
–How soon will he come back? --________.
–You speak English well.Who teaches you?--Nobody.I learn it by _________.