. — Why do so many people go fishing in winter?
— They say fish in winter tastes better than ____ in summer.
| A．those | B．one | C．that | D．it |
Nowadays more young people have suffered from diabetes __________ it is generally realized.
| A．than | B．that | C．which | D．what |
The man didn’t know _________ the thief broke into the house and stole all his valuable things
| A．it was when that | B．when it was that | C．that it was when | D．was it when that |
There ________ no water for 2 days, the travellers were all thirsty.
| A．having been | B．had been | C．is | D．was |
Her father told her to be careful when _____ the street. 
| A．he is crossing | B．she is crossing | C．crossed | D．crossing |
Hardly ________ home when he was asked to go back to work. 
| A．had he arrived | B．he had arrived | C．did he arrive | D．he arrived |