While he was investigating ways to improve the telescope, Newton made ______ discovery which completely changed ______ man’s understanding of colour.
| A．a; 不填 | B．a; the | C．不填; the | D．the; a |
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. — You look troubled.
— The director asked me to finish this task by Sunday. How can I ________ to?
| A．attempt | B．manage | C．decide | D．happen |
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I’d love ________ room on the higher floor so that I can have a bird’s eye view of ________ city.
| A．the…a | B．a…the | C．/…the | D．a…a |
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It is generally considered unwise to give a child ________ he or she wants.
| A．however | B．whatever | C．whichever | D．whenever |
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－Did you enjoy yourself last night?
－Yes，it's very nice of you．I appreciated_______to the party．
| A．to be invited | B．to have invited | C．having been invited | D．being invited |
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－Hello，Anne，it’s Jack here Can I speak to Robert，please?
－Hi，Jack．Robert_______in the garage,Can I get him to call you back?
－Sure．Thanks．
A．has worked B．is working C．worked D will work