One of the consequences of our planet's being warming up is a（n）_______ in the number of natural disasters.
| A．result | B．account | C．reason | D．increase |
She understood what I was talking about, ________ it was the first time we had spoken together.
| A．whether | B．even if |
| C．as if | D．Since |
As you can see，the number of cars on our roads________ rising these days.
| A．was keeping | B．keep |
| C．keeps | D．were keeping |
Ten minutes later，a bus________ and everybody got on it.
| A．came up | B．added up |
| C．looked up | D．put up |
David said that it was because of his strong interest in literature________ he chose the course.
| A．that | B．what |
| C．why | D．How |
—So you didn’t say “Hi” to your partner when you saw her?
—Well，I stopped and smiled at her，but she________ me and walked on with her head high.
| A．refused | B．failed |
| C．missed | D．ignored |