The plan for the new design occurred to Mr. Smith______on his work recently.
| A．while concentrated | B．while concentrating |
| C．while he concentrated | D．while concentrating himself |
—Thank you so much for helping me with my English .
— .
| A．With pleasure | B．A pleasure |
| C．I’m glad to hear that | D．No thanks |
It is your own fault you are so tired . You oughtn’t to have stayed up so late .
| A．when | B．how | C．where | D．why |
The president’s speech was boring; it is ,in fact ,rather inspiring and interesting.
| A．anything but | B．nothing but | C．no more | D．all but |
Whenever you are to walk on the ice , that it is solid and safe enough.
| A．examine | B．check | C．try | D．make |
—Did you have a good sleep last night ?
—Yes ,never sleep .
| A．badly | B．better | C．worse | D．best |