It's a pity that we'll have no _______to watch the Olympics in Tokyo， 2020．（ ）
| A． |
choice |
B． |
chance |
C． |
reason |
D． |
place |
The manager of the hotel was waiting at the gate _______ the guests arrived．（ ）
A．whileB．whenC．unlessD．after
Liu Changjian，the command pilot of Sichuan Airlines Flight 3U8633， successfully _______ down the plane last month．（ ）
A．has broughtB．will bring
C．broughtD．bring
The local guide spoke ______ she could to make the visitors understand her．（ ）
A．as clear asB．as clearly as
C．so clear asD．so clearly as
I saw John in the park this morning．
It _____ be him． He has gone to HongKong．（ ）
A．can'tB．canC．mustn'tD．must
_____ do you visit your grandparents， Timmy？
Once a week．（ ）
A．How manyB．How longC．How muchD．How often