So _____ that all the living things died out gradually .
| A．serious polluted the lake is | B．serious polluted is the lake |
| C．seriously polluted the lake is | D．seriously polluted is the lake |
foot
| A．fool | B．tooth | C．shoot | D．wood |
They are______ interesting novels _______ I want to read them once again.
| A．so; that | B．such; as |
| C．so; as | D．such; that |
—How long have you been learning English?
—About four months.
—________! Your English is so good.
| A．You can’t be serious | B．You got it |
| C．I couldn’t agree more | D．I’m stuck |
Bob called to tell his mother that he couldn’t enter the house, for he ________ his key at school.
| A．had left | B．would leave |
| C．was leaving | D．has left |
It was only after he had read the papers _____Mr. Gross realized the task before him was extremely difficult to complete.
| A．when | B．that | C．which | D．what |