You can not borrow books from the school library______you get your student card.
A,before B,if C,while D,as
—Don’t hesitate to buy the dress if you like the design and pattern.
—No, I won’t,the price is reasonable.
| A．as soon as | B．as well as | C．as far as | D．as long as |
I am delighted as chairman of the students，union last winter.
| A．to appoint | B．to be appointed |
| C．to have appointed | D．to have been appointed |
The beautiful sunset our attention，and we stopped to watch it.
| A．caught | B．paid | C．fixed | D．slipped |
We're still at the airport. If it weren’t for the delayed flight, we _____the concert right now.
| A．can be enjoying | B．must have enjoyed |
| C．would be enjoying | D．should have enjoyed |
It never occurred to humans until the mid-l990s some animals can be cloned.
| A．where | B．that | C．when | D．what |