---The excellent student is said ________in Germany last year .
--- No wonder he has a good command of German .
| A．to study | B．to be studying |
| C．to have studied | D．studied |
Some people waste a lot of food _______ others haven’t enough to eat.
| A．however | B．while | C．since | D．as |
Come and visit me whenever _______.
| A．you are convenient | B．you will be convenient |
| C．it is convenient for you | D．it will be convenient for you |
---Will Tony come to the party tonight?
---I’m not sure. He _______stay at home preparing for the coming exam.
| A．must | B．might | C．can | D．need |
The house I grew up _______ has been pulled down and replaced by a hospital.
| A．in it | B．in | C．in that | D．in which |
______ the project in time, the staff have been working at weekends since last summer.
| A．Completing | B．Having completed | C．To have completed | D．To complete |