Half an hour has been made full ______ of _____ the problem.
| A．using; studying | B．use; to study |
| C．to use; to study | D．use; studying |
----Mr. Li told me once he had a fall and broke his leg .
----_______was that.
A Since when B For how long C How long ago D How soon
This is an illness that can result in total blindness ____left untreated.
A after B if C since D unless
Mum wrote to me every week ,_____she was too busy with her teaching work .
A if B even C unless D when
____ is always right.
A No matter what you say B Whatever you say
C No matter how you say D However you say
The machine can only do _____man asks it to do .
A how B after C what D when