【推荐1】I could appreciate ________ if you could do me a favor.

A．it

B．that

C．what

D．which

【推荐2】When you go outing with your sisters, you must see to ________ that they are safe.

A．everything

B．it

C．them

D．yourself

【推荐1】___________ it is learning in school through computer or relaxing at home with video games and TV, time spent on screens has become an essential part of modern life.

A．Because

B．While

C．Whether

D．As

【推荐2】—Sometimes I am even sleepy in class.
—It’s terrible. You _____ as well go to bed earlier.

A．should	B．will
C．might	D．can

【推荐3】—How long do you think it will be _____ we totally control the pandemic?
—Hard to say, but COVID-19 vaccine developed by Pfizer and BioNTech is reportedly more than 90 percent effective.

A．before

B．when

C．until

D．since

【推荐1】________ has been mentioned above，continued chairman after he took a sip of coffee，________ the project must be carried out before spring flood comes.

A．As；that	B．That；which
C．This；which	D．It；that

【推荐2】The boy asked his mother ________ go out to play table tennis.

A．that he could	B．if he could
C．if could he	D．whether could he