It is too early in the _____ to expect many visitors to the city.
| A．time | B．hour | C．season | D．term |
. 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 |
. In , the take-home food sold by supermarkets made up per cent of the total, while _____supplied by fast restaurants was per cent.
| A．that | B．which | C．it | D．one |
. He made another wonderful discovery, ________ of great importance to science.
| A．which I think is | B．which I think it is | C．which I think it | D．I think which is |