Food prices increased ________ 10% in less than a year.
| A．for | B．to | C．by | D．at |
His uncle went abroad in 2010, and _______since．
| A．has not been heard of | B．had not been heard of |
| C．had not heard of | D．has not heard of |
Only by seizing every possible_____ to practice can you possibly hope to improve your spoken English.
| A．solution | B．opportunity | C．experience | D．touch |
—Why do many people keep dogs as pets?
—Because they are our ____ friends and they never desert their masters.
| A．wise | B．brave | C．loyal | D．handsome |
The survey ____ in our school last month shows that about three percent of the students are addicted to the Internet games.
| A．conducted | B．was conducted | C．conducting | D．to be conducted |
You _____ read a book in the sun—it'll do harm to your eyes．
| A．couldn't | B．wouldn't | C．needn't | D．mustn't |