Recent research shows that adding protein to the post-exercise meal will also ________ the recovery process．That seems to be something helpful to a patient．

A．reduce

B．decrease

C．weaken

D．enhance

________ education is one of the most important things that we are pursuing in our school．

A．Habit

B．Character

C．Quality

D．Personality

________ Julia will be able to get help for the rescue is not certain yet．

A．That

B．Whether

C．If

D．Who

To our surprise, we found the boy ________ when given encouragement．

A．annoying

B．annoyed

C．having been annoyed

D．annoied

They told us that China usedn't to export cars to European countries, ________ ?

A．didn't they

B．did it

C．used it

D．used they

________ in her new novel, the young writer kept thinking and writing for a dozen hours in her study．

A．Having deeply absorbed

B．Deeply absorbing

C．Deeply having been absorbed

D．Deeply absorbed

________ , yet the students managed to finish it within the time limited．

A．As the experiment was difficult

B．Difficult as the experiment was

C．Difficult although the experiment was

D．In spite of the difficult experiment was

He paid the boy ＄10 for washing ten windows, ________ hadn't been cleaned for at least a year．

A．most of which

B．most of them

C．all of them

D．all of these

________ a manned spacecraft to the moon will be the next important step to be taken by Chinese．

A．Launched

B．Having launched

C．Launching

D．To have launched

Not a visitor ________ when an operation is being performed in the emergency room．

A．is permitted to enter

B．is permitted entering

C．is to permit others to enter

D．permits anyone to enter