Brian does well in math， — . He always gets good scores on his math exams.

It seems that the aged people _________ the H7N9 moreeasily from the recent cases.

Scientists have come to the conclusion ___________ the temperature on Earth is getting higher and higher.

80.It was not until 1920 ______ regularradio broadcasts began.

Mr．White tohospital for an examination yesterday but he was too busy to come．