It wasn’t _______ he took off her mask _______ I recognized he should be a famous film star.
| A．when; that | B．until; when |
| C．until; that | D．when; then |
We have to __________finding a solution.
| A．set about | B．set down | C．set out | D．set up |
His aunt’s letters ___of those beautiful days when they used to live together in his hometown.
| A．call him on | B．call him for | C．call him up | D．call him up 。 |
When seeing a stone in front of the car, _____.
| A．the car stopped | B．the car was stopped |
| C．the driver stopped the car | D．the car was stopping |
Smith wrote an article on ____ he failed to pass the exam.
| A．why | B．that | C．who | D．what |
It wasn’t until a month later ____ I received his letter.
| A．that | B．since | C．when | D．as |