The man in my room ________ be my brother. He is still in France.
couldn't
mustn't
needn't
can't
________ 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 _________.