When do most doctors go for a home visit?

• A、Before 11 a.m.
  

• B、From 6:30 p.m to 8 a.m.

• C、From 8:30 a.m. to 6 p.m.

• D、Between 12 noon and 3 p.m.

The reason________the president kept silent is still unknown.

• A、how

• B、why
  

• C、when 
  

• D、what

P: No, not very serious, but the doctor told me to stay in bed and have a good rest.
S: I see. I’ll  _____55_____ as soon as he came back.
P: Thank you. Goodbye!
S: Bye!