Mary and I see each other ____, but not as often as we used to.
| A．sooner or later |
| B．once in a while |
| C．in the end |
| D．more or les |
.
With age, the mineral content of human bones decreases, ________ them more fragile.
| A．make | B．to make | C．made | D．making |
.
Let's go a little faster, ______________ we'll never get there on time.
| A．yet | B．or | C．so | D．and |
.
—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 |
.
—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 |
.
Take the spare batteries with you _________________ you need them.
| A．so that | B．even if | C．as long as | D．in case |