246. Nelson Mandela played and is still playing a leading ________ in ending apartheid(种族隔离政策) in South Africa.
| A．use | B．roles | C．role | D．Parts |
I’m writing to you and ask whether you’d like to give us ___ how to learn English.
| A．some advice on | B．some advices about | C．an advice about | D．advices on |
I wonder why he hasn't __ any of my letters for such a long time.
| A．replied | B．replied to | C．answer for | D．asked |
--Look! John is ___. Let’s go and see if he needs any help.
A, out of the breath B. out of breath C. out of his breath D. out of breathes
It's dark, Mum ___ be waiting for my return.
| A．can | B．should | C．must | D．may |
___ the invitation of Mr. Black, she attended the tea-party.
| A．At | B．On | C．To | D．With |