As you know, there are a few formalities to be _____ before you enter a foreign country.
| A．gone through | B．gone against | C．gone over | D．gone up |
You must keep it _______ in mind that education is the first productivity.
| A．mildly | B．firmly | C．tightly | D．roughly |
This word is wrongly spelt；a letter is _______.
| A．left behind | B．left alone | C．left out | D．left off |
It makes _______ big difference to keep calm when giving _______ first aid.
| A．a, / | B．/, the | C．a, the | D．/,a |
_______, the experiment will be successful.
| A．If carefully doing | B．If it done carefully |
| C．If carefully done | D．If doing carefully |
In the front of the hall _______ a group of pupils, who were listening to the lecture attentively.
| A．were sitting | B．sat | C．sit | D．was sitting |