Ladies and gentlemen, please fasten your seat belts .The plane _____ .
| A．takes off | B．is taking off | C．has taken off | D．took off |
Always read the_______on the bottle carefully and take the right amount of medicine.
| A．explanations | B．instructions | C．descriptions | D．introductions |
____ I admire David as a poet, I do not like him as a man.
| A．Only if | B．If only | C．As much | D．Much as |
You’ll have to wait for one more week, ______ the manager will be back from his trip.
| A．before | B．when | C．as | D．until |
We finally bought several books by Shakespeare, ______ is one.
| A．which of them | B．which of whose | C．of which this | D．and of them |
Without facts , a person can’t form a correct opinion , for he needs to have actual knowledge _____ his thinking .
| A．which to be based on | B．on which to base |
| C．which to be based | D．which to base |