The light bulb ______ by Edison in the middle of the 1780s.
#44649
A
is invented
B
was invented
C
invented
D
invent
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—Mr Wang, I’m afraid I can’t finish this task by myself.—Don’t worry. Two more helpers _______ soon.
#44387
A
have been found
B
will be found
C
are found
D
were found
A photo _____ each time that button _____.
#44456
A
has taken… has pushed
B
has been taken…has pushed
C
is taken … will be pushed
D
is taken … is pushed.
---At present, one of the best ways to study is working in groups. ---More chances _______ to students to learn from each other.
#44491
A
offer
B
are offered
C
have offered
D
are offering
－Oh, my God! I can't find my key to the office.－Don't worry. Perhaps it _________ at your home.
#44778
A
left
B
has left
C
was left
D
had left