The computer in 1946 in America.
— Must I answer this question in English? — No, you_________.
— Lisa, we need to clean the kitchen. Could you _________ the trash? — Yes, sure.
Helen has two sisters and a brother. Her brother is working, but _________her sisters are still at school.
Now the train service is very good. The trains are _________on time.
_________ March 28, about 20 Chinese cities turned off lights of major buildings for one hour.