• 2022-05-31
    No one hopes that he will ______ his usefulness.
    A: retain
    B: keep
    C: prolong
    D: survive
  • D

    内容

    • 0

      He tells _______ jokes to keep his students interested in his lecture.

    • 1

      He built a pair of wings of a size suitable to _______ his own weight, and made use of gravity as his motor. A: entertain B: retain C: obtain D: sustain

    • 2

      He is a gentle man and he always keep his ( ). A: words B: word C: talk D: say

    • 3

      He sold his old car to one of his friends. His old car ______ to one of his friends.

    • 4

      He couldn't , but he said he would do his best. A: keep B: say C: promise D: find