Some problems ___ in the lecture by Mr.Smith are very popular in our school, such as the waste of electricity, water and food, etc...
| A．referring | B．referred to | C．referring to | D．were referred |
-- You know who came to our school yesterday?
-- Professor Smith? We once met at a conference.
-- ______. He came and gave a wonderful speech.
| A．How did you know that? | B．That was good news. |
| C．Got it! | D．Well Done! |
-- Do you enjoy ______ here?
-- Oh, yes, the air, the green hill, the thickly trees. Everything is so attractive.
| A．it | B．these | C．them | D．those |
--Does he always keep an appointment, Jenny'?
-- Seldom, ______.
| A．if any | B．whenever possible | C．if ever | D．when necessary |
-- I'd like to invite you to a party tomorrow evening.
-- Thank you, but ______ I'll be free I'm uncertain.
| A．while | B．if | C．when | D．whether |
Please remind ______ he said he was coming. I may be in time to meet him.
| A．where | B．when | C．how | D．what |