.
Only in this way ______ our goals.
| A．we can reach | B．can we arrive | C．we can arrive | D．can we reach |
It is time for class. Will you please get the blackboard__________?
| A．to clean | B．cleaning | C．cleaned | D．having cleaned |
This is the biggest lab__________we have ever built in our university.
| A．which | B．what | C．that | D．Where |
He is__________as a leader but he hasn’t__________in teaching.
| A．success; many experiences | B．a success; much experience |
| C．great success; an experience | D．a great success; any experiences |
Only by practising constantly__________ greater progress.
| A．we can make | B．then we will make |
| C．can we make | D．we must make |
__________ printed, this science fiction will be popular among the students.
| A．Before | B．Unless | C．Although | D．Once |