The expressions they use might whom they are speaking to or how well they know each other.
| A．instead of | B．lead in to |
| C．because of | D．depend on |
He told us that he ______ the letters in the morning.
| A．will post | B．have posted |
| C．was posting | D．had posted |
By nine o’clock yesterday evening, we ______ our work.
| A．have finished | B．finished |
| C．had finished | D．finish |
We ______ four thousand new words by the end of last year.
| A．learned | B．had learned |
| C．have learned | D．will learn |
— Did you meet Tom at the airport?
— No. His plane ________ by the time I ________ there.
| A．has taken off; got | B．took off; had got |
| C．took off; arrived | D．had taken off; arrived |
— What is your Chinese teacher like? —
| A．He is tall and thin. | B．Sorry, I don’t like him. |
| C．He is strict but friendly. | D．He doesn’t look well today. |