This map is drawn to the _______ of one inch for 1000 miles, so you can find out how far it is from Beijing to Shanghai.
Dad had to cycle to work this morning because his car _______ at the garage.
John passed the examination though he had only spent _______ on the subject as others had done.
He started to work dilligently _____ he came up with the idea of hybrid rice for the first time in the 1960’s.
Once e-mail learners _______ with the basic knowledge of how to use the network, they ______ to a local network and a global network.
Yuan Longping, known as the “father of hybrid rice”, doesn’t care about money or about ____ people call position.