.The new dictionaries are very useful. They ________ well and ________ already .
| A．sell; have been sold out | B．sold; had sold out |
| C．sell; sell out | D．are sold; have been sold out |
Gilbert wasn’t ______ the time this morning, so he was late for school.
| A．involved in | B．particular about | C．linked to | D．aware of |
Weshouldconsidertheprofessor’s advice _______ our school library provide more books on popular science.
| A．that | B．when | C．which | D．where |
If Newton lived today, he would be surprised by what _______ in science and technology.
| A．had discovered | B．had been discovered |
| C．has discovered | D．has been discovered |
Pip agreed to give some piano lessons to the girl_______ for a generous gift from her mother.
| A．in nature | B．in return | C．in turn | D．in time |
—Shall we go out for a walk?
— Sorry. This is not the right _______ to invite me. I am too tired to walk.
| A．moment | B．situation | C．place | D．condition |