Most birds find it __
__ to sleep in the trees.
| A．was safe | B．safe | C．to be safe | D．being safe |
Many a student ________ failed in the biology exam，and Tom is the only one of them who ________ decided to give up the course.
| A．have；has | B．have；have | C．has；have | D．has；has |
MoYan was awarded the Nobel Prize in 2012, made one of the Chinese people’s long-held dreams come true.
| A．it | B．that |
| C．what | D．which |
The airport _______ next year will help promote tourism in this area.
| A．being completed | B．to be completed |
| C．completed | D．having been completed |
There’s no way of knowing why one man makes an important discovery another man, also intelligent, fails.
| A．since | B．if | C．as | D．while |
What we all know is that new technology is being ________to almost every industrial process.
| A．applied | B．attempted |
| C．acquired | D．arranged |