The digital camera in our shop is of high quality. If there_________ be something wrong with it while it is still under guarantee, we would repair it __________ our expense.
His teacher worried that the student spent too much time on the computer and not enough time _______.
The teacher talked in a very low voice_____make himself________, clearly.
________is well known that great changes have taken place in China recently.
The path______the park is lined with many trees.
The number of people invited_____40, but a number of them______absent for different reasons.