英语数字6,500,431,729读成____________.
| A．six billion ,five hundred million, four hundred and thirty-one thousand, seven hundred and twenty –nine. |
| B．six thousand and five hundred million, four hundred and thirty-one thousand, seven hundred and twenty –nine. |
| C．six billion ,five hundred million, four thousand, three hundred and seventeen hundred and twenty –nine. |
| D．six thousand and five hundred billion four hundred and thirty-one thousand, seven hundred and twenty –nine. |
—Mum, I want_______ of these two dresses.
—Sorry. You can only buy one of them.
| A．all | B．none | C．some | D．both |
—Where is your mother，Tom?
—She _________________the dishes in the kitchen.
| A．washes | B．washed | C．has washed | D．is washing |
These photos _______ by my sister on Mount Tai last summer.
| A．take | B．took | C．are taken | D．were taken |
—May I play computer games, Mum?
—No, you ______. You’ve got a lot of homework to do.
| A．needn’t | B．mustn’t | C．wouldn’t | D．won’t |
Mike and I _______ net-friends. We talk on-line every week.
| A．am | B．was | C．are | D．is |