—_________ 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 |
I think the skirt on the desk can't be Lucy's. _is made of- wool.
| A．Hers | B．Herself | C．Her | D．She |
I gave my mother a bunch of flowers __ the evening of March 8.
| A．in | B．for | C．on | D．at |