That virus has the power to all the valuable files people have stored in their computers.
| A．wash away | B．smooth away |
| C．put out | D．wipe out |
She is shorter than ____in her class.
| A．any girls | B．any girl | C．any other girl | D．any of the girls |
The level of the river ___ 20 centimeters over the security line and ____must be taken to control the flood.
| A．is measured; measures | B．measures; measurement |
| C．measures; measures | D．is measured; measurement |
Edison asked his father why the hens could hatch eggs ___he couldn’t.
| A．as | B．and | C．when | D．while |
The new suspension bridge ___by the end of last month.
| A．has been designed | B．had been designed | C．was designed | D．would be designed |
--How often do you attend the evening classes?
---_____, three times per week.
| A．On the whole | B．On average | C．Little by little | D．In all |