Câu hỏi: Exactly .............. we can replace our soil disappearing through erosion is not known.

A. what

B. how

C. if

D. because

Câu 1: Applicants ................ send in their CVs.

A. asked

B. ask to 

C. are asked to

D. asked to

Câu 2: If you’re not coming, ............................

A. we had not been in such trouble

B. you may need to tell me

C. we’d never met

D. you’d be so lucky

Câu 3: The first hamburgers ..................... in Connecticut in 1895.

A. are sold 

B. were sold

C. sold

D. have been sold

Câu 4: .................................. , the phone will be cut off.

A. If you paid the phone bill today

B. Unless you pay the phone bill today

C. On condition that you had paid the phone bill before

D. In case you have paid the phone bill

Câu 5: A small design fault ................. on our latest chip.

A. has found

B. found

C. has been found 

D. find

Câu 6: Send my regards to Lawrence ............................ you see him.

A. if

B. in case

C. whether

D. provided