The scavenging air ports are located at （） that they are just exposed by the upper edge of the piston when the piston is in the bottom dead center position.
（）is a type of fog occurring close to the sea surface when the air is dry and cold-probably at least 9℃ below the sea surface temperature.
In reference to air conditioning, when air attains the maximum amount of moisture it can hold at a specific temperature, it is said to be （）.
To whom should the master render the Maritime Declaration of Health when the ship arrives at a port outside the territory?（）.
All the tickets ______ out when we arrived. A. had sold B. have been sold C. have sold D. had been sold
From the last two paragraphs we can learn that when we arrive in America to visit an American friend, we will probably be _____.
When the first-shift supervisor arrives at his office each day, one of his importantmissions is to exam the machines carefully.
When Maria first arrives at the von Trapp family, the children are hostile to her, but gradually she wins them over with her ______ and _______.
When invited to an English home, it is customary to arrive at least 10-20 minutes before the arranged time.
_________ he does his work, the boss doesn’t mind when he arrive at the office.
We hope the goods you ordered will arrive at the port of destination ________.
以下表达是否正确：Would you please tell me when the bus arrives at the railway station？你能告诉我这辆车什么时候到飞机场吗？
What should the room attendant do when the luggage arrived at the floor before the team gusts live in the rooms:
All the tickets ______ out when we arrived.A. had sold B. have been soldC. have sold D. had been sold
When we reached the station, the train had not arrived yet; so we______.
—Was the driving pleasant when you went to Mexico last summer？—No, it______for four days when we arrived, so the roads were very muddy.
When will Mr. Coleman probably arrive at the restaurant？
The child was sorry __________________ his mother when his mother when he arrived at the station.
When they arrived at the airport, they had ______.
Giussani has arrived at the conclusion that babies in high-altitude regions are more likely to have heart trouble when they grow up.
We arrived at the theatre only two minutes before the curtain______.
When we stay at a room in a house with central air-conditioning system in summer, we should set the thermostat to a higher level in ______.
You _____ （）at the airport when you arrive.
After we walked ______ the forest, and ______ a river, we arrived at that small village.
