—I had the computers repaired yesterday.
—How much did they _________ for that?
| A．cost | B．spend | C．take | D．charge |
Dr Yuan makes______ possible______ one-third more of the crop in the same fields.
| A．it; produce | B．it; producing | C．it; to produce | D．it; produced |
I don't have enough money．I, _____, can't afford to buy Audi A3 Sportback．
| A．therefore | B．so | C．however | D．thus |
Where was it ______ you _______ our maths teacher?
| A．where; came to | B．that; come across, |
| C．that; came across | D．where; come to |
----- Mary looks very upset. She _______ failed to pass the exam.
----- I guess so. It's very difficult after all.
| A． must have | B．could have | C．should have | D．might have |
— When could you have a meal with me? — I'd like to go ___ it is convenient to you.
| A．whichever | B．whenever | C．whatever | D．wherever |