.Professor White has received a letter ___ to give a lecture in Peking University.
| A．to be invited | B．being invited | C．invited | D．inviting him |
---Fancy meeting you here, Lucy! I never thought you visit us today.
---Sorry, I forgot to tell you I was coming. I hope you don’t mind me ______.
| A．calling in | B．pulling in |
| C．breaking in | D．dropping in |
--- Was it by cutting down unnecessary expenditure ______ Mr. Simon saved the firm?
--- No, it was by improving work efficiency.
| A．when | B．what | C．how | D．that |
The house, ______ door often stays open until late at night, works as a home for the guards, some of ______ are from the countryside.
| A．whose; whom | B．which; whom |
| C．whose; them | D．where; them |
---What have you learned from your experience in the USA?
---Well, meeting people from another culture ______ be very difficult.
| A．must | B．can |
| C．should | D．shall |
. ---Have you seen ____ iphone? I left it on the desk this morning.
---Is it ____ white one? I think I saw it somewhere.
| A．an; the | B．the; the |
| C．an; a | D．the; a |