The most important thing about cotton in history is ___part that it played in ____Industrial Revolution.
| A．/,/ | B．the,/ | C．the , the | D．a ,the |
Small sailboats can easily turn over in the water ______ they are not managed carefully.
| A．though | B．before | C．until | D．if |
Most birds find it safe to sleep in the trees, but ________they have eggs or young chicks, they don’t use a nest.
| A．why | B．how | C．unless | D．where |
You will be successful in the interviewyou have confidence.
| A．before | B．once | C．until | D．though |
I won’t call you, ________ something unexpected happens.
| A．because | B．whether | C．unless | D．while |
_______,his idea was accepted by all the people at the meeting.
| A．Strange as might it sound |
| B．As it might sound strange |
| C．As strange it might sound |
| D．Strange as it might sound |