Mr. Green is said________an experiment to prove their new method of solving the problem when young.
| A．to do |
| B．to have done |
| C．to be doing |
| D．to have been doing |
Paper money was in＿＿＿use in China when Marco Polo visited the country in＿＿＿thirteenth century．
| A．the；／ | B．the； the | C．／； the | D．／；／ |
—— I’d like＿＿＿＿＿information about the management of your hotel, please．
—— Well, you could have ＿＿＿＿＿ word with the manager． He might be helpful．
| A．some； a | B．an； some | C．some； some | D．an； a |
Students should be encouraged to use _________ Internet as _________ resource.
| A．不填; a | B．不填; the |
| C．the; the | D．the; a |
It’s not _________ good idea to drive for four hours without _________ break.
| A．a; a | B．the; a |
| C．the; the | D．a; the |
. My neighbor asked me to go for _________ walk, but I don’t think I’ve got _________ energy.
| A．a; 不填 | B．the; the |
| C．不填; the | D．a; the |