.Have you sent that letter off yet? There’s something important I’d like to add ______ it.
26.The researehers delermine what type of plants the virus can infect(感染) and____insects can carry the virus.
25.—Did you get my letter? —I received one just as I____.
24.When she called at his studio, she____that he had gone to Japan.
23.Robert made a call to his parents yesterday afternoon. To his disappointment, ____of them answered it.
22.I_____stop by sometime and thank her for all her help.