China’s Beidou global satellite navigation system will have been completed by 2020, ________ of more than 30 satellites.
It’s crazy of you to spend more time playing computer games than you _______ studying.
--Do you think you can finish the project by five o’clock this afternoon? ---_______. I’ll be busy with my term paper all day.
This hotel is the highest building in the city, from _______ top you can enjoy a good view of our city.
Knowing what colors look good _______ your skin is of great importance when you buy clothes.
_______, Sharon couldn’t find her lost wallet.