Write the correct forms of verbs in the brackets

75. My brother ( study )…………………….. in this school for two years.
76. We will be able  (live) …………………. on the moon .
77. Let’s (help) ………………….mom, Lan. She (clean) ………….the floor.
78. Look! The plane (fly) ………………….towards the airport. It (land) …………...
79. Why we (not/ go) ……………….to Ha Long Bay this summer?
80. If It (not – rain ) ………………..tomorrow, we ( finish ) ………………………the work.