Question

4. Use the correct form of verbs in the following sentences:
a. It's about time we (wear) mask.
b. If I were a doctor, I (diagnose) the Covid-19 infected patients.
c. A number of people around the world (to be) dying from Covid-19.
d. I used to (handshake) with the people i met, but now I don't
e. Nobody (know) when the vaccine of Covid-19 will be invented​

Answer 1

a) wearing

b) diagnostic

c)to begin

d)hand shakes

e) knowing

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