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Many companies give away small quantities of their produce as samples ____ people can try them before buying them.
| A．if | B．because | C．so that | D．since |
．After his retirement, John fishing as one of his new hobbies.
| A．took over | B．took in | C．took for | D．took up |
．In this workshop, the output of July was three times __________ of January.
| A．that | B．this | C．one | D．it |
.Leonardo da Vince_____birds kept in cages in order to have the pleasure of setting them free.
| A．is said to be buying | B．is said to have bought |
| C．had said to buy | D．who said to have bought |
— What made Bill so angry?
— ______. His girl friend promised to come at 8:30, but she hasn’t come yet.
| A．Having kept waiting | B．Being kept waiting |
| C．To be keeping wait | D．Being kept waited |
Finding her car stolen, ___________.
| A．a policeman was asked to help | B．the area was searched thoroughly |
| C．it was looked for everywhere | D．Mrs. Green reported it to the police |