He made another wonderful discovery, _____ of great importance to science．
| A．which I think is | B．which I think it is |
| C．which I think it | D．I think is |
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Mark Zuckerber
g is the founder of the site Facebook , ______ you can have a look at each other’s pictures.
| A．where | B．which | C．when | D．as |
It surprised us all ______ Kate made such big progress in this final exam.
| A．when | B．that | C．how | D．whether |
_______ ninety-nine percent of the panda’s diet is bamboo, it also eats corn, apples and sweet potatoes.
| A．If | B．While | C．Because | D．Since |
The manager demanded that the workers extra hours to complete the task ahead of time.
| A．worked | B．would work | C．work | D．had worked |
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