The volunteers put up many signs to remind people ________ the environment.
A.protect B.to protect C.protecting D.protected
Every photo taken with my friends reminds me ________ the warm and sweet memories.
A.with B.to C.of D.for
The couple________ Kunming for twenty years. They love there deeply.
A.have been to B.have gone to C.have been in D.have gone in
—I will go to Thailand this weekend. Any advice, Lucy?
—Maybe you can ask John's brother for some advice. He ________ Thailand twice.
A.has been to B.has gone in C.has gone to D.has been in
Mr. Wang isn't in the office. He and his students ________ the Summer Palace.
A.have been to B.have gone to C.have gone in D.have been in
It seems ________ no one knows what happened just now.
A.when B.which C.that D.where
