Private cars really provide much convenience to people, and ___ they cause too many problems.

--- What do you think of the speech?--- The speaker said _____ nothing worth listening to.

_____ the woman entered the office, Tom’s eyes lit up.

These　good　sare＿＿for　export，though　a　few　of　them　may　be　sold　on　the　home　market．

As the idea of low-carbon life is now _____ accepted, more and more people travel by public transport.