He devoted all the time _____ his research .
#92715
A
to do
B
doing
C
to doing
D
did
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This kind of material can be used to _____plastics.
#95998
A
taking the place of
B
take place of
C
taking place of
D
take the place of
There are still many problems ______ before we are ready for a long stay on the Moon.
#88396
A
solving
B
solved
C
being solved
D
to be solved
Some people believe that they would be better off more adaptive activities in their leisure time, such as establishing relationships and teaching their children．
#95246
A
doing
B
to do
C
having done
D
to be doing
We're leaving at six o'clock ,and hope_________ most of the journey by lunch time.
#98694
A
to do
B
to have done
C
to make
D
to have made
The first satellite ____telephone signals was called Early Bird.
#93370
A
was used to send
B
used to be sent
C
was used to sending
D
used to send