Once ___ what to do, these computers will show great power in carrying it out.
| A．to teach | B．teaches | C．teaching | D．taught |
The child was _______ after supper.
| A．enough tired to go to bed |
| B．too tired to go to bed |
| C．so tired that he went to bed |
| D．very tired, he went to bed |
Poor _____ it may be, there is no place like home, _____ you may go.
| A．as; wherever | B．though; whenever |
| C．in spite of; when | D．that; wherever |
_____ hard she tries, she can hardly avoid making mistakes in her homework.
| A．Much | B．However | C．As | D．Although |
When you read the book, you' d better make a mark _____ you have any questions.
| A．at which | B．at where |
| C．the place | D．where |
Helen listened carefully _____ she might discover exactly what she needed.
| A．in that | B．in order that |
| C．in case | D．even though |