[ Grammar ]
You are working very hard on this material.
A. helping verb
B. linking verb

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Modal Verbs › ViewStudents (pay) attention to the teacher if they want to learn.
A. have to
B. must
C. should
D. mustn’t
Grammar › View
A. lamp
B. mirror
C. cabinet
I suddenly remembered that I ___ my keys.
A. forgot
B. had forgotten
C. was forgetting
D. had been forgetting
Grammar › View
It …. outside when it is in September to April.
A. rain
B. rains
C. raining
D. rained
