1 . It is very important that we          be honest about what we do not know.

A．need

B．will

C．must

D．can

2 . Just as I was hurrying to class, there ________ come Tom with a long story to tell you.

A．could

B．must

C．might

D．would

3 . Public health experts kept telling citizens it was of utmost importance that social distancing and hygiene habits ________ amid the pandemic.

A．were to be kept	B．had to be kept
C．must be kept	D．should be kept

4 . — ________ we take the subway to the airport now?
—I think so. The traffic ________ be very heavy at this time of the day.

A．Must, must

B．can, can’t

C．can’t, may

5 . —Must the government of Philippines (菲律宾政府) say sorry to China.
—Yes, they ________. Their behaviour has deeply hurt Chinese people.

A．need

B．must

C．can

D．may