After several years of observation, the research group ______ the conclusion that language acquisition is faster when students ______ to the situation where it is spoken.
| A．has come to; expose | B．have arrived at; are exposed |
| C．has concluded; are exposed | D．have reached; expose |
I don't remember who came first，but we all________the lecture.
| A．attend | B．attended |
| C．have attended | D．are attending |
We can't avoid negative thoughts，but we should make it a habit to replace each negative thought with a positive________．
| A．one | B．ones |
| C．the one | D．that |
Clive Palmer，the designer of Titanic II，________to answer questions about the project's cost.
| A．abandoned | B．declined |
| C．decreased | D．regretted |
The couple's birthday this year happened to fall on ________ same day，________Monday in September.
| A．the；/ | B．a；/ |
| C．a；the | D．the；a |
Most people will gradually gain confidence as they________life.
| A．get through | B．look through |
| C．break through | D．go through |