We were swimming in the lake __________ suddenly the storm started.
| A．when | B．while |
| C．until | D．before |
—I failed again. I wish I ____ harder.
---But you ____.
| A．had worked; hadn’t | B．worked; don’t |
| C．worked; didn’t | D．had worked; didn’t |
While there are quite a few differences in the education system, in many countries education is ____.
| A．usual | B．regular |
| C．normal | D．universal |
Some plants are vey ____ to light; they prefer the shade.
| A．sensible | B．available |
| C．adjustable | D．sensitive |
—Can those ____ at the back of the classroom hear me?
---No problem.
| A．seat | B．sit | C．seated | D．sat |
—Can I pay the bill by check?
--- Sorry, sir. But it is the management rules of our hotel that payment ____ be made in cash.
| A．shall | B．mustn’t |
| C．can’t | D．will |