_____ his knowledge of the mountainous country, John Smith was appointed as our guide.
| A．In spite of | B．On account of | C．Regardless of | D．Instead of |
29. I can hardly remember any occasions _______ I get caught in a traffic jam in our town.
| A．which | B．that | C．where | D．when |
28. —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 |
27. 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 |
26. —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 |
25. 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 |