The first use of atomic weapons was in 1945, and their power ________ increased enormously ever since．

A．is

B．was

C．has been

D．had been

Children under 12 years of age in that country ________ be under adult supervision when in a public library．

A．must

B．may

C．can

D．need

I had to buy ________ these books because I didn’t know which one was the best．

A．both

B．none

C．neither

D．all

The accident is reported to have occurred ________ the first Sunday in February．

A．at

B．on

C．in

D．to

－ Sorry to have hurt you．

－ ________．You didn’t mean to, did you?

A．Take it easy

B．OK

C．Don’t say so

D．Forget it

Beck is an honest business man．Our company and his have had a lot of ________ in the past five years．

A．goods

B．agreements

C．rewards

D．deals

－ Alice, you look puzzled．Have you understood it?

－ Yes, I ________ another problem just now．

A．have thought of

B．thought of

C．was thinking of

D．had thought of

－ How come a simple meal like this cost so much?

－ We have ________ in your bill the cost of the teapot you broke just now．

A．added

B．included

C．obtained

D．charged

You must ________ it that all the experts will be present at the conference．

A．make sure

B．make

C．make sense

D．make out

－ We didn’t find Smith attending the lecture．

－ No one ________ him about ________ a lecture the following day．

A．told; there to be

B．had told; there is

C．told; there was

D．had told; there being