The Loisels did what they could ___ the debts.
| A．to pay off | B．to pay for | C．paid off | D．paid for |
26. With age, the mineral content of human bones decreases, ______ them more fragile.
| A．make | B．to make | C．made | D．Making |
25. Let’s go a little faster, _________we’ll never get there on time.
| A．yet | B．or | C．so | D．And |
24. ––How long have you been here?
––Only about five minutes. Henry and Simon ______ here with me.
| A．walk | B．have walked | C．walked | D．had walked |
23. ––Was ______ problem solved?
––We were trying to think of ______ way out, but it was difficult to find one.
| A．a; a | B．a; the | C．the; a | D．the; the |
22. Take the spare batteries with you_________you need them.
| A．so that | B．even if | C．as long as | D．in case |