—I must apologize for ________ ahead of time.
—that’s all right.
| A．letting you not know | B．not letting you know |
| C．letting you know not | D．letting not you know |
— Mum，I really think Dad should have a break and get relaxed．
—Yes．He too long.
| A．read | B．had read | C．has been reading | D．is reading |
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 |