1 . Joe Bidon urges Americans to follow the advice of the local politicians, many of ________ the President will meet with later today. (用适当的词填空)

2 . October is a great time to visit Inner Mongolia Autonomous Region, ________travelers can go to the quiet Ejina to enjoy the wonderful scenery of Euphratica forest(胡杨林).

A．then

B．where

C．when

D．there

3 . ________is reported, vaccines (疫苗) do an excellent job of preventing serious Covid-19 illness and deaths, but are less good at stopping infections, particularly since the emergence (出现) of the more infectious Delta variant.

A．It

B．Which

C．That

D．As

4 . It is now a children’s festival, ________ they can dress up and go to their neighbours’ homes to ask for sweets. (用适当的词填空)