21£®The falling of apple from a tree helped Newton to discover law of gravity.
A£®an; the B£®an; a C£®the; the D£®the; a
22£®—Where did you see Avatar?
—It was in the same cinema I ever watched 2012.
A£®that B£®which C£®where D£®as
23£®You return the novel to the library by tomorrow, or you will be fined.
A£®shall B£®can C£®will D£®may
24£®With so many things , we haven’t decided on the final plan yet.
A£®considered B£®to consider C£®having considered D£®considering