He is one of those who ______________ very hard.
| A．works | B．work | C．is | D．are |
Did the police catch the thief___________?
| A．on the end | B．by the end |
| C．at the end | D．in the end |
He doesn’t do his homework___________, though he has ___________.
| A．carefully enough , enough time |
| B．enough carelessly, time enough |
| C．carelessly enough, enough time |
| D．enough carefully , enough time |
—_________ was light bulb invented ________ ? —Thomas Edison.
| A．When, / | B．Who, by |
| C．Who, / | D．What, for |
Some students enjoy raising pet dogs while__ don't agree with them.
| A．the other | B．another | C．others | D．the others |
The twins have tried, but__ of them has got the chance to study abroad.
| A．both | B．all | C．none | D．neither |