20．It was four o'clock in the afternoon_____he and his grandpa reached the museum in Guanghan, _____an official warmly received them.
| A．that; where | B．when; that | C．when; where | D．that; when |
I still remember to the Famen Temple and what I saw there.
| A．to take | B．to be taken | C．taking | D．being taken |
The best means to go there _________walking.
| A．is | B．are | C．to be | D．be |
He is determined to become a specialist ________ computer when he grows up.
| A．for | B．in | C．on | D．about |
The teacher, with 6 girls and 8 boys of her class, ________ visiting a museum when the earthquake struck.
| A．was | B．were | C．had been | D．would be |
They argued ________each other _________ where to spend the golden week.
| A．at; over | B．with; about | C．about; at | D．over; on |