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John does important research _______ the best ways to help the old.
#48571
A
finds
B
finds
C
found
D
to find out
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Do you know who _______ help if you feel stressed?
#48675
A
to ask
B
asks for
C
to ask for
D
asks to
—You forgot______ off the lights?   It’s still on.—But I remember _______them off before I went out of the room.
#49390
A
turning; to turn
B
to turn; turning
C
turning ; turning
D
to turn; to turn
Mary used to _____short hair.
#49101
A
be
B
have
C
had
D
has
 If you don’t study English all the time, you’ll have a difficult time ____ it in the future.
#50597
A
studying
B
to studying
C
studied
D
be studying
—How about ______ this new shirt on?   —Good idea!
#49784
A
trying
B
to try
C
try
D
tries