26. ________ the help of their group, we would not have succeeded in the investigation. # z- W) u5 y8 L6 J& b( r5 r- VA) Besides B) Regardless of C) But for D) Despite 6 k3 n* r4 \3 U7 ^. \0 w# ?# p27. ________ much is known about what occurs during sleep, the precise function of sleep and its different stages remains largely in the realm of assumption.& q' {3 R7 l5 \4 s2 a
A) Because B) For C) Since D) While9 v }$ V) H7 R$ i% h. r" L
28. John doesn‘t believe in ________ medicine; he has some remedies of his own.- M: Q8 m, @- b' N0 A* \! n
A) standard B) regular C) routine D) conventional% k5 V0 C+ ? M" }, C+ `" B2 X
29. Owing to __ competition among the airlines, travel expenses have been reduced considerably. $ a2 l1 W# d2 q ~7 K: T# b# kA) fierce B) strained C) eager D) critical5 d; v1 H _4 Z. M) Q) ]
30. In Africa, educational costs are very low for those who are __ enough to get into universities. ! w( J4 c3 d$ q, P2 i e' p6 `A) ambitious B) fortunate C) aggressive D) substantial 2 u! H6 P( X# q1 Y26-30 CDDAB