Several minutes after its launch, the X-37B plane successfully sent back its first___________to the control center.
| A．mark | B．sign | C．instruction | D．signal |
— Oh, my cat is really fat.
— You __ have given her so much food.
| A．wouldn't | B．mustn't | C．couldn't | D．shouldn't |
— Can you __ what these characters on the rock are?
— Not really.
| A．carry out | B．make out | C．come out | D．go out |
It is said that they __ $ 200, 000 for the house up to now.
| A．will offer | B．are offering | C．offer | D．have offered |
__ his telephone number or e-mail address, she had some difficulty getting in touch with John.
| A．Not knowing | B．Not to know | C．Not known | D．Not having known |
It was after he went to college __ he realized the importance of forming a reading habit.
| A．that | B．when | C．since | D．as |