The book was written careful observations and detailed studies.
| A．on the ground of | B．on behalf of |
| C．on average | D．on the basis of |
If you __________ early tomorrow morning, you would be there by noon.
| A．have started | B．were start | C．were to start | D．had started |
The villagers have offered much help to us and we think we should do something for them __________.
| A．in return | B．in place | C．in fashion | D．in danger |
As a writer, she succeeded in calling __________ to many of the terrible wrongs that existed at that time.
| A．interest | B．attention | C．notice | D．mind |
When the spaceship leaves the earth at very high speed, the astronauts feel __________ they are being crushed against the spaceship floor.
| A．as if | B．even though | C．even if | D．what if |
He set off __________ the direction of the river.
| A．for | B．to | C．on | D．in |