—What should we do first if we want to develop our village? —A lot of new roads_____, I think. A. have to build B. must build C. must be built
What will you be like ______?
I think there won’t be ______ schools in the future.
I think he will come back ______ three days.
We will use ______ and get ______ on the Internet.
---What is Mr Zhang doing? ---He is writing some English words ______ the blackboard ______ chalk.