— Be careful, _ you will make fewer mistakes.
—Thanks for encouraging me.
A. but B. or C. and D. so
— Can I speak to Mrs Green？
— Sorry, wrong number. Please to 114 and check the number.
A. put out B. put off C. put through D. put away
—I’m still wondering which school our son should choose.
— him alone, he can make up his mind.
A. Leave B. Keep C. Let D. Allow
These physics problems are _______ difficult that _______ students can solve them.
A. such; few B. such; little C. so; few D. so; little
Miss Green sounded _______ on the phone. She offered to help us with our studies.
A. politely B. friendly C. properly D. smoothly
Your grandfather ________ be over sixty. But he looks like a young man!
A. can’t B. can C. mustn’t D. must
