The flowers his friend gave him will die unless______ every day.
| A．watered | B．watering | C．water | D．to water |
I don’t like such a person ____ often lies before your face.
| A．what | B．that | C．as | D．which |
By using ears one can tell the direction ____ a sound comes.
| A．in which | B．from which | C．with which | D．through which |
I don’t believe the reason ____ he has given for not coming to the lecture.
| A．why | B．that | C．how | D．what |
In the forest we observed some trees ____the leaves were black with disease.
| A．where | B．of which | C．in which | D．whose |
I often think of the years ____ I worked with the foreigners, ____ has had a great effect on my later life.
| A．that; which | B．when; which | C．which; that | D．when; who |