Generally speaking，prices of daily goods ________ through the Internet are lower than store prices.
A．to buy B．are bought
C．buying D．bought
The country has already sent up three unmanned spacecraft，the most recent ________ at the end of last March.
A．has been launched B．having been launched
C．being launched D．to be launched
________tomorrow’s lessons，I have no time to play with you.
A．Not preparing B．Not prepared
C．Not having prepared D．Having not prepared
—I would like to buy an expensive camera.
—Well.We have several models________.
A．to choose from B．of choice
C．to be chosen D．for choosing
The little boy still needs the________20 dollars to do with some things________.
A．remaining；remained to be settled
B．remaining；remaining to be settled
C．remained；remained to settle
D．remained；remaining to settle
________the working efficiency，the boss allows the employees to have a coffee break.
A．Improving B．To improve
C．Having improved D．Improved
