1, ” When ----------? “ - In 1928
A. penicillin was discovered B. did penicillin discovered
C. was penicillin discovered D. did penicillin discover2, In order to ensure that the medication does not have side – effects, pharmacists have tried____ it on a variety of animals.
a. to experiment b. experimenting c. to be experimented d. experiemented
3,In financial terms, IPO( initial public offering) means___ a company's shares to the public for the first time and then the stock is said to be listed on the stock exchange.
a. Sell b. to sell c. selling d. be sold
4,The full version of Salem's newest song that meant___ was leaked.
a. to launch b. to be launched c. launching d. be launched
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Sinh Học lớp 12
