1 . Someone called me up in the middle of the night,but they hung up________I could answer the phone.

A．since	B．until
C．before	D．as

2 . It is reported that a space station_________________(build) on the moon in years to come.

3 . It is the only place ______ the earth to have been visited by humans.

A．beneath

B．below

C．beyond

D．behind

4 . The activity is rewarding and fulfilling, which helps b________ our cultural confidence. (根据首字母单词拼写)

5 . Travellers on a tight ______ might prefer ______ .

A．bill; calculating

B．change; catering

C．budget; backpacking

D．cash; bargaining

6 . Students are not permitted ___________(bring) mobile phones to school. (所给词的适当形式填空)

7 . He received a medal in reward for his ________ (brave). (所给词的适当形式填空)

8 . ____________ (basic), it’s “ I’ve got to produce this product and then, at the end of year, present it to NASA.” (所给词的适当形式填空)

9 . Careless users and local guards are ________ (blame) for the broken blikes. （所给词的适当形式填空）

10 . There is no obvious ________(突破) with cancer at present.