----How was the dance? -----______________.
| A．That’s OK. | B．Don’t mention it. |
| C．I’d love to. | D．It was so much fun. |
. The teachers hope the little ________ has been learned will be useful when they leave school.
| A．that | B．what | C．knowledge | D．which |
. “This is a window, ________ the sun comes in.” said the lady to her baby.
| A．where | B．which | C．by which | D．through which |
. Living in the western part of the country has its problems, ________ obtaining fresh water is not the least.
| A．with which | B．for which | C．of which | D．which |
. These students will graduate from the university next summer, ________ they will have studied here for four years.
| A．by then | B．by that time | C．by the time | D．by which time |
. Many new means of transportation have been developed in our century, ________ perhaps the hovercraft.
| A．and the strangest of which is | B．the strangest of which being |
| C．the strangest of which is | D．and the strangest of them being |