He arrived home after the long journey，________.
| A．tired | B．being tired | C．to be tired | D．tiring |
If we _________ now to protect the environment, we’ll live to regret it.
| A．hadn’t acted | B．haven’t acted | C．don’t act | D．won’t act |
— Are you sure the delegation will come to our school next week?
— _____. The head of it has just emailed me about the departure time of their flight.
| A．No wonder | B．You bet | C．Don’t mention it | D．Definitely not |
It suddenly occurred to me I hadn’t locked my door．
| A．which | B．where | C．that | D．whether |
The result was not the same as they had expected, ______ was rather disappointing.
| A．that | B．which | C．when | D．what |
London's road traffic map is like a cobweb(蜘蛛网) of small streets, offering drivers more _______ when one road is blocked.
| A．barriers | B．characters | C．similarities | D．alternatives |