.In the United States, bus travel doesn't cost much as train travel, ?
| A．don't they | B．does it | C．do they | D．doesn't it |
I can hardly remember any occasions _______ I get caught in a traffic jam in our town.
| A．which | B．that | C．where | D．when |
—Where have you been all day?
—I _______ some former classmates and I couldn’t get back until it was dark.
| A．have met | B．met | C．would meet | D．had met |
The process of producing electricity may also give out CO2, _______ you heat your house with electricity instead of charcoal.
| A．even if | B．as long as | C．as if | D．as soon as |
—How much of the foreign expert’s speech have you understood?
—Next to nothing. I wish I _______ harder at English.
| A．worked | B．had worked | C．would work | D．were working |
Don’t refer to the dictionary every time you come across a new word as sometimes its meaning may be _______ clearly in a given context.
| A．picked out | B．ruled out | C．brought out | D．taken out |