Probability is the mathematical study of the _____ of an event's occurrence.
| A．desire | B．likelihood | C．result | D．effect |
Did you ask whose computer________？
| A．this blue one was | B．is this blue one |
| C．it was this blue one | D．this blue one is |
—Do you think it’s going to rain over the weekend?
—________.
| A．I don’t believe | B．I don’t believe it |
| C．I believe not so | D．I believe not |
Johnson had made up his mind to give it up，but on________ second thought he determined to try________ third time.
| A．/；a | B．/；/ | C．a；a | D．the；a |
He left a good impression on me________ I saw him.
| A．for the first time | B．the first time |
| C．first time | D．it’s the first time |
—Where did you find the wallet?
—It was at the stadium________ I played football.
| A．that | B．where | C．which | D．there |