Remove the batteries when they become weak or when the unit is not in use for extended periods. This will damage to the unit from battery leakage at such times.
| A．disappoint | B．concern | C．instruct | D．prevent |
The number of the people present at the concert ________ much smaller than expected. There ________ many tickets left.
| A．was; was | B．were; was | C．were; were | D．was; were |
It was not until I got home ________ I found my wallet missing.
| A．that | B．when | C．where | D．which |
Comrade Wang ________ be in Shanghai—I saw him in the company only a few minutes ago.
| A．mustn’t | B．can’t | C．may not | D．isn’t able to |
—Little Jim has been eating sweets all day.
—It’s no ________ he is not hungry
| A．matter | B．doubt | C．problem | D．wonder |
—You were out when I dropped in at your house yesterday.
—Oh, I________ for a friend from Beijing at the railway station.
| A．was waiting | B．had waited | C．am waiting | D．have waited |