The students _____ are hard-working and ready to help others should be praised.
A．who B．whom C．which D．whose
—What’s the noise outside?
—Some children_____ hide-and-seek in the yard.
A．were playing B．are playing C．have played D．played
It was not until Bob took off his dark glasses that I _____ him.
A．realized B．requested C．recorded D．recognized
Buses here are always crowded with passengers, so I prefer _____ there rather than take a bus.
A．cycle B．cycling C．to cycle D．being cycled
------- Where did you find him?
-------It was in the hotel _____ he lived.
A．that B．where C．which D．what
The scientist ______ much of his time to increasing the rice production.
A．spent B．offered C．devoted D．paid
