Since then the number of people taking driving lessons ________ 20％.
| A．has increased to | B．increases by | C．has increased by | D．have increased by |
At present, computer knowledge has become ___________ requirement as the ability to read and write.
| A．so basic a | B．so a basic | C．as basic a | D．as a basic |
Make sure the gas is turned off after a bath, which would ________ cause danger.
| A．somehow | B．meanwhile | C．otherwise | D．furthermore |
Bats are surprisingly long-lived creatures, some ________ a life span of 20 years.
| A．having | B．had | C．have | D．to have |
We won’t ______ you ______ away with cheating in the exam.
| A．let; getting | B．have; get | C．let ; keeping | D．have; getting |
The surgeon suggested that he __________ at once.
| A．needed operating on | B．needed operation |
| C．need operating on | D．need to be operated |