Scientists say it may be five years ______ it is possible to test this medicine on human patients．
| A．since | B．until | C．before | D．when |
It’s a little surprising that a house made of wood or bamboo may stay up in an earthquake while _______ made of steel and concrete may fall down.
| A．one | B．that | C．it | D．what |
There was an oil painting _______ in the corner. It _______ there for several days.
| A．laying; had laid | B．lain; had laid | C．lying; had lain | D．laid; had been lain |
Seeing the teacher _______ the classroom, the boy pretended _______ the text.
| A．walking in; to read | B．coming in; reading |
| C．entering; to be reading | D．entered for; to have read |
People who have _______ eyes should be very careful while applying eye makeup as it might lead to watering and redness.
| A．energetic | B．attractive | C．physical | D．sensitive |
---Why does she always ask you for help? ---There is no one else ________, is there?
| A．who to turn to | B．she can turn to | C．for whom to turn | D．for her to turn |