To learn English well, we should find opportunities to hear English ________ as much as we can.
#89208
A
speak
B
speaking
C
spoken
D
to speak
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The country has already sent up three unmanned spacecraft, the most recent          at the end of last March. 
#97890
A
has been launched
B
having been launched
C
being launched
D
to be launched
_____to reach them on the phone, we sent an email instead.
#92184
A
Fail
B
Failed
C
To fail
D
Having failed
He apologised to me for his ________ my letter.
#96664
A
delaying answering
B
delay to answer
C
delaying to answering
D
delaying to answer