ComradeLi________beinBeijingbecauseIsawhimintownonlyafewminutesago.

• A.mustn’t
• B.can’t
• C.maynot
• D.isn’tableto

Whenhesuddenly________upthesubjectofgeneticengineering,therewasanembarrassedsilence.

• A.took
• B.brought
• C.showed
• D.came

Themorewelookedatthepicture,________.

• A.thelesswelikedit
• B.welikeitless
• C.betterwelikedit
• D.itlookedbetter

________somanypeopleintheUnitedStatesbeenoutofworkastoday.

• A.Morethaneverbefore
• B.Inthepast,therehavenever
• C.Neverbeforehave
• D.Formerly,thereneverwere

Thisdiploma(毕业文凭)________thatyouhavecompletedhighschool.

• A.entitles
• B.certifies
• C.secures
• D.approves

Theproblem________whenthestudentsrefusedtodotheirhomework.

• A.arose
• B.aroused
• C.rose
• D.raised