—How many times Carl to the Great Wall?—Only once.
When you are planting trees, the trees ________ straight in the hole.
I was about to park my car when a policeman stopped me. He pointed to a sign “________”.
Jim is a nice boy ________ likes helping others.
----Can you tell me _________ ? ----They cost 200 yuan.
---- ________ will your father come back from Beijing? ---- In two days.