_______ weather it is, we shall set out on time.
| A．Whatever | B．However | C．Whenever | D．Whether |
That’s the factory _______we paid a visit last year.
| A．where | B．to which |
| C．which | D．that |
The field research will take Joan and Paul about five months; it will be a long time _____ we meet them again.
| A．after | B．before |
| C．since | D．when |
All the travelers _____that they should bring their ID cards with them.
| A．have reminded | B．are reminded |
| C．were reminding | D．had been reminded |
There is a big dog _______to a fence outside the house.
| A．tying | B．tied |
| C．to tie | D．ties |
The fog was so heavy this morning that drivers could hardly ________ the things just ten meters away from them.
| A．turn out | B．look out |
| C．let out | D．make out |