Moreover, __________you may hardly believe, the examiners had decided in advance to fail half the students taking part in the exams.
| A．which | B．that | C．who | D．whom |
----I’m sorry, but there is no smoking on this flight.
----Oh, I _____ that. Sorry, I won’t again.
| A．don’t know | B．didn’t know | C．won’t know | D．haven’t known |
—I really don’t know how to thank you enough．
—．
| A．No problem | B．Think nothing of it | C．With pleasure | D．Glad to hear that |
On our way to school, suddenly it began to rain, and we hurried to take______under a big tree．
| A．recovery | B．notice | C．advantage | D．shelter |
I can still remember that it is since the 1990’s, _____ we began to use cell phones,_______ the number of mobile users has greatly increased．
| A．while; when | B．when; what | C．before; that | D．when; that |
—I can never forget the day ___ we spent together in the summer camp．
—Well, especially the day _______it suddenly began to rain in the middle of the night．
| A．when; when | B．which; when | C．what; that | D．on which; when |