﹣The plane won't take off ______ the thick clouds move away．（ ）
﹣﹣Let's wait patiently for the announcement from the airport．
A．sinceB．thoughC．whileD．until
Many people have lost their homes because of wars. It’s important for people ________ a peaceful world.
| A． |
have |
B． |
had |
C． |
to have |
D． |
to be having |
________ the weather improves, we’ll have to cancel the outdoor picnic.
| A． |
Unless |
B． |
If |
C． |
Because |
D． |
When |
—Could you tell me ________ pay the bills?
—You can pay your bills through Alipay（支付宝）online.
| A． |
how much I’ll |
B． |
how many I’ll |
C． |
how can I |
D． |
how I can |
Neither Saturday nor Sunday________ OK because I will be quite busy these two days.
| A． |
are |
B． |
is |
C． |
am |
D． |
be |
The Forbidden City (紫禁城), the largest palace in the world, ________ more than 600 years ago.
| A． |
built |
B． |
were built |
C． |
was built up |
D． |
was building |