Most of us won’t realize the of health until we lose it.
A. courage B. value C. reason D. purpose
—Have you finished the work?
—Not yet, but we'll keep ________ until we make it.
A. failed B. trying C. tried D. failing
At last，the teacher _________ who stole Li Ming’s pen.
A. find B. found C. found out D. looked for
They were all very tired, but ____ of them would stop to take a rest.
A． any B．some C．none D．neither
The children compete ______ each other to reach the other end of the pool.
A．against B．in C．at D. for
Do you know which is______ longest river in the world?
A. a B. an C. the D. /
