Berlin is ________ capital of Germany. ( )
A./B.aC.the
Many people have lost their homes because of wars. It’s important for people ________ a peaceful world.
have
had
to have
to be having
________ the weather improves, we’ll have to cancel the outdoor picnic.
Unless
If
Because
When
—Could you tell me ________ pay the bills?
—You can pay your bills through Alipay(支付宝)online.
how much I’ll
how many I’ll
how can I
how I can
Neither Saturday nor Sunday________ OK because I will be quite busy these two days.
are
is
am
be
The Forbidden City (紫禁城), the largest palace in the world, ________ more than 600 years ago.
built
were built
was built up
was building