Scientists from different countries are trying to_____ a good way to solve the energy problem.
| A．keep up with | B．come up with |
| C．catch up with | D．meet up with |
Don’t let the kid do so much housework .He is so young, ______ .
A. thoughB. after allC. at times
Books are made ___paper and paper is made ____ wood .
A. from; ofB. of ; fromC. of ; of
The Smiths _______ China for ten years , so they have been used to the life here.
A. have been toB. have gone to C. have been in
I _____ listen to music to relax myself in my free time .
A. graduallyB. politely C. mostly
“How much do you ____?” means “ What ‘s your _____ ?”
A. weigh; weigh B. weigh; weight C. weight; weight