.
. ---All the building materials have been washed away.
---So I have heard. But there was no sign ______ a heavy rain was on the way last night.
| A．when | B．If | C．which | D．that |
By 16:30, ______was almost closing time, nearly all the paintings had been sold.
| A．which | B．when | C．what | D．that |
We look forward to the day when the motorcar has been replaced by some less dangerous ______of transport.
| A．means | B．methods | C．manners | D．ways |
It took him a long time to ______the skills he needed to become a professional artist.
| A．acquire | B．inquire | C．require | D．request |
I’m so glad you’ve come here to ______this matter in person.
| A．lead to | B．see to | C．turn to | D．refer to |
They’ve made full preparations, but it remains ______whether they will be able to do a good job in the experiment.
| A．to see | B．seen | C．being seen | D．to be seen |