New technology ______ to make sure that the cars, taxis, buses and trains we use ______ the air.
| A．is used; not to pollute | B．has used; is not polluted |
| C．is being used; do not pollute | D．has been used; to pollute |
I recommended ________ an English-Chinese dictionary, which I thought would be of great help to his studies.
| A．him buy | B．he bought | C．to buy | D．buying |
It is the day October 1st, 1949 _____ the People’s Republic of China was founded _____ we’ll never forget.
| A．that; that | B．that; when | C．in which, that | D．when, that |
No one knows exactly when the first people arrived in _______ is now called California.
| A．where | B．what | C．which | D．that |
He cooked a great meal to ______ the help of his neighbors in finding his lost little daughter.
| A．acknowledge | B．thank | C．express | D．admit |
Tom makes up his mind to get a seat for the football match _____ it means standing in a queue all night.
| A．despite | B．as though | C．even if | D．no matter |