He must be helping the old man to water the flowers,______ ?
| A．is he | B．isn’t he | C．must he | D．mustn’t he |
Look at the trouble I am in! _______I had followed your advice.
| A．Only if | B．If only | C．Even if | D．So long as |
When it comes to giving his kids the education they deserve, the 51-year-old father knows he never _______ college without financial aid.
| A．could have attended | B．could attend |
| C．had attended | D．should have attended |
Columbus _________ the New World in 1492.
| A．discovered | B．found | C．found out | D．looked for |
I’ll finish the job ____ I come across great difficulty.
| A．however | B．even though | C．no matter | D．as though |
My brother wants to work in the factory which _________ now.
| A．is building | B．has been built | C．is being built | D．is to be built |