More and more high-rise buildings have been built in big cities ________ space.
A. in search of B. in place of C for lack of D. in memory of
I thinkefforts we have made to constructnew DeZhou are paying off
| A．不填；the | B．the；a | C．the；不填 | D．不填；a |
— Do remember to charge the mobile phone 12 hours when you first use it．
— ______.
| A．Made it | B．Got it | C．Understood it | D．Remembered it |
While building a tunnel through the mountains, ______.
| A．an underground lake was discovered | B．there was an underground lake discovered |
| C．a lake was discovered underground | D．the workers discovered an underground lake |
Scientists are convinced ______ the positive effect of laughter ______ physical and mental health.
| A．of；at | B．by；in | C．of；on | D．on；at |
In American there are more households with pets than ______ with children.
| A．those | B．these | C．ones | D．that |