_______ his return from America, he got down to his research.
#92169
A
While
B
In
C
As
D
On
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---I had practiced my spoken English, but still failed in the oral test. ---Don’t be discouraged. _____ and you will surely pass it. 
#92027
A
Make a bit more effort
B
To make a bit more
C
Making a bit more effort
D
If you make a bit more effort
_____ I believe,and you will find him very capable.
#91991
A
Having a talk with Tom
B
Given a talk with Tom
C
One more talk with Tom
D
If you have a talk with Tom