The mother often tells her son to be a good boy, warning him to ______ trouble.
| A．hold back from | B．keep out of |
| C．break away from | D．get rid of |
The house I grew up ________ has been taken down and replaced by an office building.
| A．in it | B．in | C．in that | D．in which |
I invited Mary and Jane to dinner, but of them came.
| A．none | B．either | C．both | D．neither |
．The plant is dead . I ________ it more water.
| A．will give | B．would have given | C．must give | D．should have given |
The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.
| A．what | B．which | C．that | D．though |
．He has ______ little education that he finds it impossible for him to equal ______ important a task.
| A．so ;such | B．such ; so | C．so ;so | D．such ; such |