This is a very interesting book．I’ll buy it， ．
| A．how much may it cost | B．it may cost |
| C．however much it may cost | D．how may it cost |
Although I hurried, ____ I was late for the train.
| A．but | B．so | C．yet | D．that |
The school requested that all the students ____ school uniform on weekdays in school.
| A．wear | B．wore |
| C．wears | D．have worn |
Bats are surprisingly long-lived creatures, some _____ a life span of around 20 years.
| A．having | B．had | C．have | D．to have |
I often think of those occasions ______ we had a happy time together.
| A．which | B．when |
| C．on which | D．Both B and C |
Every day _____a proverb aloud several times until you have it memorized.
| A．read | B．reading | C．to read | D．reads |