______, we didn’t know each other, but now we are good friends.
| A．First | B．First of all | C．At first | D．For the first time |
The mobile phone has influenced people’s life a lot since it _________.
| A．invents | B．invented |
| C．is invented | D．was invented |
-- Chinese astronauts can also walk in space now.
-- Yes, they're______ our nation.
| A．proud of | B．pleased with |
| C．the pride of | D．known for |
--Where are the ______ students?
--They are playing football with ______ students from Hilltop School.
| A．boys，/ | B．boys, the |
| C．boy, / | D．boy, the |
--Is Tom still in New York or already back at home?
--I’m not sure ________. I’ll call to make sure.
| A．how he will be back | B．that he has come back |
| C．why he has come back | D．if he has been back |
Everyone may feel time______very quickly when they do something interesting.
| A．go by | B．to go by |
| C．went by | D．gone by |