24. The Niagara Waterfalls, ______ is shaped like a semicircle, are 670meters wide, and fall 56 meters in an awesome white sheet of water.
| A．what | B．where | C．the largest of which | D．in which |
---- This store has such high prices.
---- I agree. Never again ____ here.
| A．I will shop | B．will I shop | C．I do shop | D．shop I |
It was not until she came to see us ____ her mother was ill in bed.
| A．when we knew | B．that did we knew | C．that we knew | D．that did we know |
The boy wanted to ride his bicycle in the street, but his mother told him _____.
| A．not to | B．not to do | C．not do it | D．do not to |
---- I’ll be away on a business trip. Would you mind looking after my cat? --- Not at all. ____.
| A．I’ve no time | B．I’d rather not | C．I’d like it | D．I’d be happy to |
---- Do you mind my taking this seat?
---- ____.
| A．Yes, sit down please | B．No, of course not |
| C．Yes, take it please | D．No, you can’t take it |