问题描述：
he didn't have _______ vacations last year.
Young workers usually make _______money than old ones.And they have to spend _______ time on the new work
The scientists have tried _______ times,but they still don't have any information about the UFO.
If I spend _______ time on study ,I am sure I will get better grades.
Young workers usually make _______money than old ones.And they have to spend _______ time on the new work
The scientists have tried _______ times,but they still don't have any information about the UFO.
If I spend _______ time on study ,I am sure I will get better grades.
问题解答：
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