To speed up the__________ of letters the Post Office introduced automatic sorting.A.treat

To speed up the ______of letters, the Post Office

According to the passage, a barter economy can lead to______.A．rapid speed of transactions

I shouted to the driver of the tractor to ______ and let me through.A．pull outB．pull upC．p

The primary goal of Informative Speaking is______.A．to let audience learn somethingB．to in

The speed of radio waves is equal to ________of light. A. those B. that C. the one D. t

The first rule of camping is to keep a clean camp site, so let’s tidy______ up.A: itB: