Hardly _ when they realized that it was too late to catch the last train．
| A．the clock had struck twelve |
| B．the clock had been struck twelve |
| C．had the clock been struck twelve |
| D．had the clock struck twelve |
--- _____ Tracy was in such a hurry ?
---I don’t know．She might have been running to catch the bus.
| A．Why do you think | B．Why you think |
| C．Do you think why | D．Why not think |
Stressful environment leads to unhealthy behaviors such as poor eating habits, which _____ increase the risk of heart disease.
| A．by chance | B．in other words | C．in return | D．in turn |
—You don’t see the professor from Singapore quite often, do you?
—No, we only meet ______．
| A．eventually | B．constantly | C．occasionally | D．frequently |
Attempting to get home before dark, ___________
| A．Tom’s bike broke down on the way | B．it happened that Tom’s bike hit a car |
| C．a car knocked Tom off his bike | D．Tom knocked into a tree |
The house rent is high, I've got about half of the space I had at home and I'm going to pay ______here.
| A．as four times much | B．as much three times |
| C．much as three times | D．three times as much |