Ted came for the weekend wearing only some shorts and a T-shirt, ______ is a stupid thing to do in such weather.
| A．this | B．that | C．what | D．which |
12.It took us over an hour_______along the street.
| A．walk | B．to walk | C．walking | D．walked |
13.I think it a great honour_______to visit your country.
| A．to invite | B．inviting | C．having invited | D．to be invited |
14.Many people now make_________a rule to buy cards for their friends before Christmas.
| A．themselves | B．it | C．that | D．This |
15.__________is very clear to everyone that he's round and tall like a tree.
16.
| A．This | B．What | C．That | D．It |
17..In the United States, bus travel doesn't cost much as train travel, ?
18.
| A．don't they | B．does it | C．do they | D．doesn't it |