—I wonder why Mr Green hasn't showed up at the meeting yet.
—I'm not sure，but he________in a traffic jam driving here.
| A．could be stuck | B．might have been stuck |
| C．might be stuck | D．must have been stuck |
The village has developed a lot ________ we learned farming two years ago.
| A．when | B．which | C．that | D．where |
The kitchen is often the busiest room in a household, so it’s important to make sure it _____well.
| A．smoothes | B．functions | C．pays | D．measures |
______ label to each of the trees, with detailed introduction of their features, and visitors will know more about them and how to protect them.
| A．To attach | B．Attach | C．Attached | D．Having attached |
Some young people these days just ______ go out of their homes to contact the real world．
| A．mustn’t | B．won’t | C．mightn’t | D．shouldn’t |
What is concerning us greatly is ________ the workers held up in that area yesterday will be set free.
| A．that | B．what | C．when | D．which |