We’ll be free tomorrow，so I suggest ______ to the history museum.
| A．to visit | B．visiting | C．we should visit | D．a visit |
It has been proved ____ several new kinds of medicine____ a positive effect on the cure of H7N9.
| A．which，has | B．if, has |
| C．that, have | D．what, have |
It was the middle of the night_____ my father woke me up and told me to watch the football game.
| A．that | B．as |
| C．which | D．when |
—Is the chemistry experiment easy? —______. I’ll just do my best.
| A．I think so | B．Certainly |
| C．Not a little | D．Anything but |
The number 5.12 is a special number,__ ,I think, that will be remembered by Chinese people forever.
| A．what | B．it | C．which | D．one |
The country has already sent up three unmanned spacecraft, the most recent__at the end of last March.
| A．has been launched | B．having been launched |
| C．being launched | D．to be launched |