1．--There so many foreigners in the streets these days.
-- They might be runners in the Yellow River Estuary (入海口，河口) International Marathon.
A. is B. are C. have D. will be
3．—Have they visited the zoo many times.
—______________. Only once.
A. Yes, they have B. No, they haven’t C. No, they have
4．“They have a lot to eat and drink.” It is a structure of ________.
A. S+V+P B. S+V+IO+DO C. S+V+DO+CO D. S+V+DO
